Hidden Horror

Creature — Horror    (CMC:3)

When Hidden Horror enters the battlefield, sacrifice it unless you discard a creature card.

If the presence of evil were obvious, it wouldn't be nearly as dangerous.

2 PD3 • ENBrom

™ & © 1993—2011 Wizards of the Coast

Legal in: Modern,Mirage Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Hidden Horror {1}{B}{B} Creature — Horror When Hidden Horror enters the battlefield, sacrifice it unless you discard a creature card. 4/4

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4/1/2008
When the ability resolves, you choose whether to sacrifice the creature or perform the other action. If you can't perform the other action, then you must sacrifice the creature.
4/1/2008
If the creature is no longer on the battlefield when the ability resolves, you may still perform the action if you want.

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Card Hidden Horror is not on TCGPlayer.