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Archangel of Thune - Flying and Lifelink - Good Keywords but also can pump the board with +1/+1 Counters whenever we gain life. With a few Lifelink creatures, we can easily build up an army of powerful creatures. And if we have The Ozolith in play, if there is a board wipe, we can move all those +1/+1 Counters over to it to pump up another creature later on.
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Bassara Tower Archer - Hexproof and Reach - This is mainly a Buried Alive target, as Hexproof is extremely useful, and Reach counts as one of Kathril, Aspect Warper's keywords, but it can also be a good (potentially one-time) blocker if our opponents have a large Flying creature coming our way.
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Bontu the Glorified - Menace and Indestructible - A powerful beater on her own, but also allows us to sacrifice any creatures with Indestructible and get them into the graveyard for Kathril, Aspect Warper.
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Bruna, the Fading Light
- Flying and Vigilance - While Bruna costs a lot, there are several Angel or Human reanimation targets that we can look for when playing her, notably her sister counterpart Gisela, the Broken Blade
to meld together to form Brisela, Voice of Nightmares
. Other good targets include Avacyn, Angel of Hope, Archangel of Thune, Sigarda, Host of Herons, Eternal Witness, and Slippery Bogbonder.
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Carnage Tyrant - Trample and Hexproof - Another powerful beater that will serve us well no matter where it is. If we play Kathril, Aspect Warper and give it Indestructible or Double Strike, this dino becomes quite terrifying.
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Doom Whisperer - Flying and Trample - Provides two good keywords and gives us Surveil for two life, which we can use to smooth out draws or put creatures into the graveyard for Kathril, Aspect Warper.
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Glissa Sunslayer - First strike and Deathtouch - The combo of First strike and Deathtouch is very powerful, enabling us to swing out basically every turn without fear of being blocked, allowing us to get one of her three possible effects almost every combat unless our opponents have a good number of chump blockers. If we do connect with an opponent, we can either draw a card, destroy an enchantment (The enchantment doesn't even have to belong to the player we attacked!), or remove up to 3 counters from target permanent (Planeswalker/Saga hate or other counters our opponents might be using).
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Nethroi, Apex of Death - Deathtouch and Lifelink - This delightfully terrifying Cat Nightmare Beast is one of my favorite cards from the Ikoria set, and I almost built a deck around him. He is one of our alternate Win-Cons, as when we Mutate him, we can return creatures with total power or less to the battlefield. We can go get things like Carnage Tyrant and Archangel of Thune.
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Oketra the True - Double Strike and Indestructible - She is another good target for Buried Alive or Entomb, as she has the all-important Double Strike plus Indestructible, both of which can make Kathril, Aspect Warper very difficult to deal with.
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Sanguine Spy - Menace and Lifelink - In addition to having some good keywords, she is a sacrifice outlet and source of card draw. For and sacrificing another creature, we can Surveil 1, potentially dumping two powerful keyword creatures into the graveyard for a single mana. And on our end step, if we have five or more mana values among cards in our graveyard, we can pay two life and draw a card.
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Shadrix Silverquill - Flying and Double Strike - Gives us another Double Strike, which is very important to make Kathril, Aspect Warper a 1-Hit-KO, but if we play it out first, we get a variety of useful options and some political power. At the beginning of combat on your turn, we may choose two out of the following three modes (Each mode must target a different player): 1. Target player creates a 2/1 white and black Inkling creature token with flying, 2. Target player draws a card and loses 1 life, or 3. Target player puts a +1/+1 counter on each creature they control. The +1/+1 counters option would be the most beneficial for us, since those counters can be saved/stored on The Ozolith, but being able to either draw a card or create a Flying blocker could also be beneficial.
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Sigarda, Host of Herons - Flying, Hexproof - Sigarda works great in the graveyard, as she can provide Hexproof to Kathril, Aspect Warper, but having her on the field eliminates one possible way to remove an Indestructible and Hexproof Kathril, Aspect Warper, by an opponent forcing us to sacrifice Kathril, Aspect Warper.
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Stonecoil Serpent - Reach and Trample - This artifact snake provides us with one of the rare instances of Reach in this deck. And since it costs to play, we can either pump it up with a bunch of +1/+1 counters that could then be stored on The Ozolith, or we could just cast it for , effectively discarding it so we can send those two keywords to the graveyard for Kathril, Aspect Warper.
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Thalia and The Gitrog Monster - First strike and Deathtouch - Another powerful keyword combination similar to Glissa Sunslayer. This dynamic duo gives up a lot of benefits, starting with an additional land drop on each of our turns. They also make creatures and nonbasic lands our opponents control enter the battlefield tapped, and when they attack, we must sacrifice a creature or land, then draw a card. A great way to put some of our Indestructible creatures into the graveyard and draw a card at the same time.
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Tower Winder - Reach and Deathtouch - A tutor for Command Tower, plus a powerful defensive option.
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1x Valentin, Dean of the Vein (STX:333) f / Lisette, Dean of the Root
- Menace and Lifelink - Valentin is a cheap source of Graveyard hate in the early game, exiling our opponents creatures when they die or enter the graveyard. Once we have enough mana, we can start paying to create Pest creature tokens, which could be used as cheap blockers. On the flip side, Lissette acts like a more restrictive/pseudo Archangel of Thune, as whenever we gain life, we can pay , and all our creatures get a +1/+1 counter and gain Trample until end of turn.
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Vorinclex
- Trample and Reach - A 6/6 for five mana is already nice, but add on Trample and especially Reach, along with an enter the battlefield effect to fetch two Forest lands to our hand, and we've got a sweet addition. Plus, if we have enough mana, we can pay to flip him into The Grand Evolution
, which Mills, Reanimates, Pumps, and acts as a pseudo boardwipe with Fight.