Kaalia of the Vast One generic, one red, one white, one black Legendary Creature Human Cleric 2/2 Flying Whenever Kaalia of the Vast attacks an opponent, you may put an Angel, Demon, or Dragon creature card from your hand onto the battlefield tapped and attacking that opponent
But frankly, Im most bothered by how its impossible to run anything but a terrible deck from start to finish, because the game provides no means of obtaining your desired cards other than to endlessly farm and crack booster pack after booster pack and hope for good fortune
Auras like Aqueous Form or Spirit Mantle for example
You just have to clear it with your friends before you do
Transcendence is confusing, and not as good as it looks on paper most of the time