Squealing Devil

Creature — Devil    (CMC:2)

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) When Squealing Devil enters the battlefield, you may pay . If you do, target creature gets +X/+0 until end of turn. When Squealing Devil enters the battlefield, sacrifice it unless was spent to cast it.

Rakdos

72 DIS • ENMatt Cavotta

™ & © 1993—2006 Wizards of the Coast

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

Oracle Text (click to copy):

Squealing Devil {1}{R} Creature — Devil Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) When Squealing Devil enters the battlefield, you may pay {X}. If you do, target creature gets +X/+0 until end of turn. When Squealing Devil enters the battlefield, sacrifice it unless {B} was spent to cast it. 2/1

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View this MTG card on Gatherer

5/1/2006
For this creature to not be sacrificed,  must have been spent on the  mana cost. It doesn't matter if  is spent on .
5/1/2006
You choose the value of X as Squealing Devil's ability resolves. X can be 0.
5/1/2006
If this enters the battlefield in a way other than announcing it as a spell, then the appropriate mana can’t have been paid, and you’ll have to sacrifice it.  

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