Criatura — Zumbi
2 / 2
Golpe duplo
Quando Campeão da Cripta entra em jogo, cada jogador coloca em jogo de seu cemitério um card de criatura com custo de mana convertido menor ou igual a 3.
Quando Campeão da Cripta entrar em jogo, sacrifique-o, a menos que

tenha sido gasto para jogá-lo.
The first triggered ability isn't targeted, so the creature cards aren't chosen until the ability resolves. Each player chooses which creature card from their own graveyard to return. If a player doesn't have an applicable creature card, that player does nothing. If a player does have any applicable cards, that player must return one to the battlefield.
If this enters in a way other than announcing it as a spell, then the appropriate mana can't have been paid, and you'll have to sacrifice it.