Kaalia of the Vast is a mythic Legendary Creature — Human Cleric card from Double Masters (2XM), collector number 204. Current market price: $5.44 (foil $10.14), TCGplayer market prices via Scryfall.
Flying Whenever Kaalia attacks an opponent, you may put an Angel, Demon, or Dragon creature card from your hand onto the battlefield tapped and attacking that opponent.