Hrangar Raider

Berserk {2}{r} (As this creature attacks you may pay {2}{r}. If you do, it becomes berserk, and you sacrifice
it at the beginning of the next end step.)
When Hragnar Raider becomes Berserk, double
its power until end of turn.
"In the heat of battle, no man is more dangerous than
one who does not fear death."
— Aelfred, Yorling Commander