Tyrion Lannister, the Imp

Deathtouch
Castamere—Whenever a red creature enters the
battlefield under your control, put a plot
counter on Tyrion Lannister.
{2}{w/b}, Remove three plot counters from Tyrion
Lannister: Destroy target creature.
"It's hard to put a leash on a dog once you've
put a crown on its head."