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Thassa's Devourer

Card Name

Thassa's Devourer

Mana Cost

4

Type

Enchantment Creature – Elemental

Rarity

Common

rules Text

Constellation — Whenever Thassa's Devourer or another enchantment enters the battlefield under your control, target player puts the top two cards of his or her library into his or her graveyard.

Flavor Text

When mortals claim there are places Thassa cannot reach, the sea god laughs.

Legal Formats

Commander, Legacy, Modern, Pauper, Pioneer, Vintage

Not Legal Formats

Alchemy, Brawl, Explorer, Historic, Standard

Rulings

(4/26/2014)
A constellation ability triggers whenever an enchantment enters the battlefield under your control for any reason. Enchantments with other card types, such as enchantment creatures, will also cause constellation abilities to trigger.
(4/26/2014)
An Aura spell without bestow that has an illegal target when it tries to resolve won't resolve and will be put into its owner's graveyard. It won't enter the battlefield and constellation abilities won't trigger. An Aura spell with bestow won't be countered this way. It will revert to being an enchantment creature and resolve, entering the battlefield and triggering constellation abilities.
(4/26/2014)
When an enchantment enters the battlefield under your control, each constellation ability of permanents you control will trigger. You can put these abilities on the stack in any order. The last ability you put on the stack will be the first one that resolves.