Altar of Dementia [Modern Horizons] SH6 also you cannot Xyz Summon

also you cannot Xyz Summon other monsters for the rest of this turn

(If any of the abilities use that creature's name

You must also tribute monsters from the field or your hand whose total Levels equal 7 or more

except it's a 4/4 black Zombie

Set: Retro Pack 1 Card type: Ritual/Effect Monster Rarity: Ultra Rare Attack: 0 Defense: 0 Once per turn

Altar of Dementia [Modern Horizons] SH6 also you cannot Xyz SummonSet: Modern Horizons Type: Artifact Rarity: Rare Cost: {2} Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power. "It is not that you will go mad. It is that you will beg for madness." Volrath