War of Attrition

Berserker Offering (You may cast this card any
time you could cast an instant by sacrificing a
Berserker and paying the difference in mana costs
between this and the sacrificed Berserker.)
Gravestorm (When you cast this spell, copy it for
each permanent put into a graveyard this turn. You
may choose new targets for the copies.)
Target creature you control gains frenzy 3 until
the end of turn.