Flesh Allergy

Sorcery    (CMC:4)

As an additional cost to cast Flesh Allergy, sacrifice a creature. Destroy target creature. Its controller loses life equal to the number of creatures that died this turn.

Phyrexian

62 SOM • ENVance Kovacs

™ & © 1993—2010 Wizards of the Coast

Legal in: Modern,Extended,Scars of Mirrodin Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Flesh Allergy {2}{B}{B} Sorcery As an additional cost to cast Flesh Allergy, sacrifice a creature. Destroy target creature. Its controller loses life equal to the number of creatures that died this turn.

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1/1/2011
Flesh Allergy counts each creature put into a graveyard from the battlefield that turn, including token creatures, the creature sacrificed to cast the spell, and the targeted creature (if it is destroyed).
1/1/2011
If the targeted creature is an illegal target by the time Flesh Allergy resolves, the spell is countered. No player will lose life.
1/1/2011
If Flesh Allergy resolves but the targeted creature is not destroyed (because it's indestructible or enchanted by an Aura with totem armor, for example), its controller will still lose life.
1/1/2011
You can target a creature you control, then sacrifice that creature to pay the additional cost. However, if you do, Flesh Allergy will be countered for having an illegal target. You won't lose any life.
4/15/2013
You must sacrifice exactly one creature to cast this spell; you cannot cast it without sacrificing a creature, and you cannot sacrifice additional creatures.
4/15/2013
Players can only respond once this spell has been cast and all its costs have been paid. No one can try to destroy the creature you sacrificed to prevent you from casting this spell.

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Card Flesh Allergy is not on TCGPlayer.