
Creature — Devil
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
When this creature enters, you may pay . If you do, target creature gets +X/+0 until end of turn.
When this creature enters, sacrifice it unless was spent to cast it.
2/1
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For this creature to not be sacrificed, must have been spent on the
mana cost. It doesn't matter if
is spent on
.
You choose the value of X as Squealing Devil's ability resolves. X can be 0.
If this enters 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.