It feels very similar to a scrapped mechanic from Bloomburrow that batched together all animal creature types, albeit getting around the arguments of what is and isnt an animal by just listing a ton of them individually
Eliana: We did it
Plus, late game, if you have the mana, you can morph, flip down, morph and potentially get two or three copies of something
Additional Notes : Card styles do not add card/s to your collection
And Standard is full of ways to make tokens, like job select in Final Fantasy, offspring in Bloomburrow, and mobilizing in Tarkir: Dragonstorm
Its adventure can keep your creatures safe for a turn at a fair price, and this cards attack trigger is also great in a deck type that usually goes wide