Thassa's Devourer
Journey into Nyx — Common
Enchantment Creature — Elemental
Sets Thassa's Devourer has been printed in:

Journey into Nyx — Common
Enchantment Creature — Elemental
Sets Thassa's Devourer has been printed in:

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Creature — Human Wizard (0/2)
Constellation — Whenever an enchantment you control enters, target player mills two cards.
Creature — Vedalken Wizard (2/3)
Whenever another blue creature you control enters, target player mills two cards.
Creature — Crab Skeleton (0/3)
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards. (They put the top two cards of their library into their graveyard.)
Enchantment Creature — Zombie (2/2)
Constellation — Whenever Agent of Erebos or another enchantment you control enters, exile target player's graveyard.
Legendary Enchantment Creature — Human Druid (2/2)
Constellation — Whenever Calix, Guided by Fate or another enchantment you control enters, put a +1/+1 counter on target creature.
Whenever Calix or an enchanted creature you control deals combat damage to a player, you may create a token that's a copy of a nonlegendary enchantment you control. Do this only once each turn.
Enchantment
Constellation — Whenever Strength from the Fallen or another enchantment you control enters, target creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard.
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