Ulvenwald Tracker is a repeatable fight effect on a body. We pay 2 mana, the Tracker tells one of our creatures that another creature is talking shit about them, then they fight. With Neyith on the board, the worst case scenario is that we just draw a card. The best case scenario is that one of our opponents' creatures has its ass kicked straight to the graveyard AND we draw a card.
Birds of Paradise is just a cheap, efficient mana dork that taps for any color of mana.
Elvish Mystic, Fyndhorn Elves and Llanowar Elves are all essentially the same creature. A cheap 1-cost dork that taps for green and helps us ramp.
Goblin Anarchomancer makes all of our spells (aside from colorless ones) cost 1 less to cast.
Mawloc is one of the most flexible creatures in our deck because we can cast as a simple 2/2 for just or we can sink even more mana into it to make it huge. This is a phenomenal creature in the late game when we have tons of extra mana available. Furthermore, if we cast it for , its Ravenous ability will draw us a card. And finally, it fights another creature as soon as it hits the board. It does everything we want to do in this deck.
Scavenging Ooze is in here in case there are some reanimator shenanigans going around. It's just a nice option to have against decks like Meren of Clan Nel Toth, Sefris of the Hidden Ways and Muldrotha, the Gravetide. It's also just good at removing combo pieces from opponents' graveyards at instant speed.
Sakura-Tribe Elder can be sacrificed to find a basic land. Useful in combat because we can block a creature and then just sac it for value and avoid the enemy creature damage.
Farhaven Elf tutors a basic land straight to the battlefield.
Wood Elves sort of does the same thing except it can only fetch Forests. Keep in mind that this can include Stomping Ground, Cinder Glade and Sheltered Thicket and that the land we fetch comes into play untapped.
Selvala, Heart of the Wilds has insane potential in this deck. At her absolute worst, she can net us 1 mana (1 to pay for her ability, we then get 2 back assuming she's the strongest creature we have). At her best however, she can give us insane amounts of mana because not only are we playing some powerful creatures on their own, but we can always pay 3 with Neyith's ability to double their power, then activate Selvala's ability for massive mana. Aside from being a powerful mana dork, she can occasionally draw us cards if we play a creature that's more powerful than anything else on the board.
Rhonas the Indomitable is fantastic in a fight deck because he has Deathtouch and Indestructible, so he'll immediately kill anything he fights and will come out unscathed. He can also pump another creature and give it trample until end of turn. This is a good way to compound with Neyith's power doubling ability if we have the mana for it.
Anger gives our whole team Haste when it's in the graveyard and we can get it there pretty easily by forcing it into a fight with a creature we know will kill it or throw it at an opponent who will be forced to block it thanks to Neyith's ability.
Chaos Terminator Lord looks like it was made for this deck. Think about it, we move to combat and double a creature's power with Neyith of the Dire Hunt, then give that creature Double Strike with Chaos Terminator Lord. Do I really need to explain why this card is good?
Toski, Bearer of Secrets is Indestructible which makes it very difficult to get rid of, but more importantly, it draws us a card whenever one of our creatures deals combat damage to an opponent. Just having this little Squirrel out gives us awesome synergy in a deck focused on combat.
Saryth, the Viper's Fang has insanely good synergy with this deck. It gives all of our tapped creatures deathtouch. This may not sound so amazing on the surface, but let's dig a little deeper. Whenever a creature is attacking, it is tapped; meaning if we swing with any of our creatures, they will have deathtouch. If that creature also happens to have Trample (for example, after being pumped by Rhona's Monument), then just 1 damage will be enough to kill whatever blocks it, and the rest will go through as trample damage. So lets say we've pumped Old One Eye into a 12/6 and swing with it. Our opponent blocks with a Wall of Omens. Just 1 damage will kill the wall thanks to Deathtouch, and 11 more will trample over. Saryth, the Viper's Fang makes it so that the maximum possible damage goes through any potential blockers. Furthermore, if one of our creatures is tapped and we use it to fight with something like Tail Swipe, it doesn't matter what its power is compared to the toughness of the other creature its fighting. Because it's tapped, it has Deathtouch, and because it has Deathtouch, just 1 damage is enough to kill whatever it deals damage to. And if all of that wasn't enough, Saryth gives all of our untapped creatures Hexproof, making them untargetable by spot removal while they're waiting to be deployed in battle.
Nylea, God of the Hunt is mainly in here to grant Trample to our whole team. Neyith unfortunately does not do that so even with all the power boosts we're giving, we need reliable ways to push damage through blockers and Nylea fits the bill. If we happen to hit 5 green devotion, she becomes a formidable 6/6 indestructible creature.
Nylea, Keen-Eyed makes our creature spells cheaper to cast and she can also give us some card advantage with her activated ability. If we don't find a creature with it, we have the choice to dump it in our graveyard; a good way to cycle out things we don't want for a better chance at finding something we do.
Goreclaw, Terror of Qal Sisma makes our creatures with power 4 or more cost significantly less. We can use this to turbo out some of our biggest threats much earlier than expected. On top of that, when she attacks, she buffs our big creatures and gives them all trample, ensuring that we can easily push damage through any potential chump blockers.
Ripjaw Raptor is the perfect card for a Fight Club deck because it draws us a card whenever it takes damage. If we pump it with Neyith and it gets blocked, we'll be drawing 2 cards. It also has a formidable 5 toughness and 4 power, great stats for a 4CMC creature.
Ohran Frostfang draws us a card whenever a creature of ours deals combat damage to an opponent. If we have Neyith of the Dire Hunt on the board, this creates a lose-lose situation for our opponent. If they block our creatures to prevent card drawing from the Frostfang, we draw cards off of Neyith's ability. If they let creatures through to prevent us from drawing cards of of Neyith, we draw them off of Ohran Frostfang instead.
Battle Mammoth is a formidle 6/5 body with Trample so it's a great target to double up with Neyith's ability. Its best party trick, however, is the fact that it draws us a card whenever an opponent targets ANY of our permanents.
Elder Gargaroth is just an insane value card. 5 mana for a 6/6 with Vigilance, Reach and Trample. Not only can this thing attack every turn and stay untapped, ready to block, but it also has some very valuable effects that occur whenever it attacks OR blocks. We can gain 3 life if we're running low, we can create a 3/3 token if we want some board presence, or we can simply draw a card. There is no reason not to run this card. It's insane.
Silverback Elder is not monkeying around. It destroys an artifact/enchantment whenever we cast any creature. If the text ended there, we'd still run this card. But it gets better, we have two additional options. We can get a land out of our deck if we need to ramp or gain 4 life if we're running low.
Defiler of Vigor can reduce the cost of our spells by turning green pips into phyrexian symbol:gp pips. On top of that, whenever we cast a green permanent, it buffs our whole team with +1/+1 counters. It's also a massive 6/6 body with Trample so it's a great target to buff with Neyith's ability.
Brash Taunter has a lot of hidden utility in this deck. For one, it's Indestructible, so it can fight or attack into anything and not be killed. Second, it can force itself to fight ANY other creature, and all damage it takes can be redirected to any opponent. The most obvious way to use this ability is to fight an enemy creature, but we can do better than that. If we have the strongest creature on the board, we can make it fight Brash Taunter and deal that damage to any opponent. If we have Neyith on the board, we can move to combat, pump a creature to double its power, then simply have it fight Brash Taunter rather than attacking. This is an excellent way to deal damage to opponents hiding behind pillow forts or if attacking into them will be too costly.
Xenagos, God of Revels can give one of our creatures Haste and double its power as well as boost its toughness by the same amount. This is an excellent ability to stack on top of Neyith's, essentially allowing us to quadruple that creature's power. Xenagos also has Indestructible so it's difficult to remove.
Zilortha, Strength Incarnate makes it so that our creatures only die by damage if that damage equals their power rather than their toughness. This helps solve the issue of Neyith only doubling a creature's power while leaving their toughness untouched. The creature is powerful, sure, but is still easy fodder to chump blockers. With Godzilla on the board, it suddenly becomes much, MUCH harder to kill our creatures in combat.
Vigor is insanely good in this deck because we're all about having our creatures trade blows with enemy creatures. If Vigor is on the board, however, suddenly our creatures aren't taking any damage but instead getting permanently buffed. What doesn't kill you just makes you stronger, right?
Kogla, the Titan Ape has impressive stats and fights a creature when it enters the battlefield. On top of that, it can destroy an artifact or enchantment whenever it attacks. A repeatable artifact/enchantment removal on a body is extremely valuable and hinders our opponents from keeping any artifact/enchantment board presence. It also has a very underrated ability in that it can return a Human to our hand to give itself Indestructible until end of turn. This is extremely useful if we have Neyith on the board because if she is targeted with a kill spell, she'll have to return to the command zone and will be more expensive to cast next time. With Kogla's ability, we can put her into our hand instead and give the big guy Indestructible. This is especially good against boardwipes like Damnation or Wrath of God.
Gargos, Vicious Watcher fights a creature whenever one of our creatures is targeted with a spell or ability. Obviously this means we can trade blows if our opponents use things like Terminate or Swords to Plowshares, but crucially, Gargos cares about ANY spell that targets one of our creatures. A lot of our targeted Fight spells do this. When that happens, Gargos will go to war and with a massive 8/7 body, it will probably win.
Old One Eye gives our whole team Trample across the board. This is useful because Neyith can buff a creature but does not give it Trample so to ensure that all that power isn't going to waste on a chump blocker, having Trample means we can push some of that damage through. On top of that, it brings an additional 5/5 token with it when it enters. Finally, in some niche scenarios, we can discard two cards to bring it back to our hand from the graveyard. This is a useful way to get Anger out of our hand and into the yard where it belongs.
C15 buffs our whole team by the highest power among creatures we control whenever it attacks (and also grants them Trample). We can take advantage of this with Neyith's ability by buffing our strongest creature because that ability resolves before attackers are declared. Then, when we attack with the Ibex, our whole team gets a massive boost that can help them run through pretty much any opposition.
Ravager Wurm has Riot, so we have the option of buffing it with a +1/+1 counter or giving it Haste. Regardless of that, we also have the option of having it fight another creature upon ETB, or nuking a land with an activated ability.
Thorn Mammoth can fight a creature whenever it ETBs or another one of our creatures ETBs. A repeatable fight effect that's completely optional? Sign me up.