Flameslinger Devil

Coldblood {1}{u}{r} (You may cast this spell for its coldblood cost if no spells were cast last turn.)
When Flameslinger Devil enters the battlefield,
it deals X damage to target creature, where X is
the number of cards in that creature's controller's
hand. If Flameslinger Devil was cast from your
hand for its coldblood cost, tap that creature. It
doesn't untap during its controller's next untap
step.