Other than Ayula, there are 21 legal, mono-green bears in MtG. This deck runs 19 of them.
"Oh my goodness," you think to yourself. "What could those two bears have possibly done to deserve being cut from this deck!? This is unBEARable!"
Well, Razorclaw Bear has the audacity to be a $36 card, so we can make due without them. Goreclaw, Terror of Qal Sisma is lovely, but she BEARly has any synergy with the rest of the deck. We do not cast many creatures with power 4 or greater, and we can get trample from other, better sources. If you feel passionately about Goreclaw, she's a legendary creature and you can make an EDH deck with her as your commander instead.
Truthfully, of the 19 bears you have left, you could probably cut a couple to make the deck more efficient. I wanted to stay true to the bear gimmick, so I've opted to keep all other bears in the deck. However, if you find yourself wanting to add new cards, you might ask yourself if 19 bears is entirely necessary. Below, I'll rank the strongest and weakest bears in the deck to help you make informed decisions about what bears you should abandon.
Strongest Bears: Ashcoat Bear, Mother Bear, Striped Bears, Ulvenwald Bear, Vivien's Grizzly, Werebear
Average Bears: Basically any traditional 2/2 for bear - Balduvian Bears, Bear Cub, Grizzly Bears, Runeclaw Bear, Spectral Bears, plus: Alpine Grizzly, Dragon-Scarred Bear, Druid's Familiar
Weakest Bears: For the most part, these bears cost more to cast than other bears without having strong synergy with Ayula. This could vary by playgroup. For example, Pale Bears and River Bear cost more than an average bear because they have islandwalk. If you don't regularly play against decks running islands, these bears would be fair to cut from the deck. Exuberant Wolfbear is a 4/4 bear for . The scenario where this creature's ability makes any difference to your game is so fringe that you’re better off pretending it has no text at all. Golden Bear is the less infuriating version of Exuberant Wolfbear as a 4/3 for . Golden Bear doesn't pretend to be anything it's not, and doesn't try to lure you in with interesting ability text. Unfortunately, from a completely unbiased perspective, this should probably be the first bear you remove from the deck.
Um, what are these NON-BEARS doing in here?
Believe me, I'm as disappointed as you are that we've been forced to run non-bear creatures. Think of it this way: these creatures either pretend to be bears, or make our bears stronger.
"Pretend?"
Your goal is to trigger Ayula's ability as much as possible, so you bet your butt that this deck is running some changelings (which are, at once, every creature type in the game). Universal Automaton, Game-Trail Changeling
, Woodland Changeling, and Webweaver Changeling are all just opportunities for more bear triggers. Webweaver Changeling is particularly strong because bears are notoriously bad at blocking flying creatures and it has reach. It's also very likely that you'll be able to trigger its ETB effect as a bonus. Birthing Boughs offers a continuous source of changelings.
The rest of the gang:
As mentioned, the goal of any other creatures you run are simply to make your bears stronger. I'll give the quick reasoning behind them all, but it should be noted that these cards can be swapped for others depending on the decks you are playing against. Check out the "Sideboard Considerations" for ideas about what other creatures you might want to play.
Aquastrand Spider: As mentioned, bears are notoriously bad at blocking creatures with flying, so opportunities to give them reach is prime. Putting more +1/+1 counters in play is also a good thing with this deck.
Beast Whisperer: Card draw is always good, and you'll draw a lot.
Caller of the Claw: A great card to help you recover from a board wipe. Obviously, if Ayula dies in said board wipe you will not be getting triggers from all these bear tokens. That said, there are plenty of other opportunities to flash Caller of the Claw in (perhaps after losing a few bears to fights) and getting those juicy Ayula triggers.
Crowned Ceratok: Trample is very important for making this deck an effective Voltron!
Den Protector: A great card simply for the ability to flip it face up and return target card (any card! not just creatures!) to your hand from your graveyard.
Drumhunter: Card draw is great, and you can tap it for mana. You will almost always have a creature with power 5 or greater.
Flaxen Intruder: You almost always want to cast this as the adventure (three bear triggers will make your opponents sweat a little), but the versatility of being able to destroy an artifact or enchantment is helpful in any EDH game. Note that you can deal combat damage to any player and destroy target artifact or enchantment; make a pact with someone at the table to let your Flaxen Intruder through, then destroy that pesky permanent your common enemy at the table has on the field.
Scavenging Ooze: Particularly strong if you are playing against decks that interact heavily with graveyards, but any opportunity to introduce more +1/+1 counters into the game as well as dump leftover is welcome in this deck.
Slippery Bogbonder: Flash in and give your creature hexproof. As if that's not enough: got lots of counters dispersed among your creatures? If someone decides not to block one of your creatures, flash this in, move all your counters onto the unblocked bear, and make your opponent suffer.
Sporeback Troll: Creating more +1/+1 counters is always helpful. Being able to regenerate any creature with a counter is even better. Regenerating a creature does not remove counters/auras/equipment because that creature is never technically destroyed and never changes zones.
Temur Sabertooth: Seize every single opportunity you have to return bears to your hand and replay them for additional Ayula triggers. Check out the "Deck Interactions" section to read more about how bounce is this deck's best friend.
Ravenous Slime: Similar to Scavenging Ooze, this card is particularly strong when playing against decks with graveyard interaction. Introducing more +1/+1 counters into the game is just a bonus! Having both cards on the field at the same time is overkill (and even actively work against each other). But I play against a LOT of decks that rely on their graveyards.
Rishkar, Peema Renegade: Create some +1/+1 counters, then every creature you own with a +1/+1 counter can now be tapped for . It's just good!
Yeva, Nature's Herald: The scariest bears are surprise bears. Being able to flash in a bear to trigger Ayula is extremely strong.