Frenzy of Fury

Rage {b}{b}{u}{u} (if a creature you control dies this
turn you may cast this spell for its Rage cost and
this also gains flash.)
Deal 2 damage to target creature or planeswalker.
If this kills the target, you may repeat this, you
may choose new targets for each repeat. This
deals 1 extra damage for every time this is repeat.
"HE WAS MY FRIEND!"
—Asriel Dreemurr