Reverberant Stroke

Reverberant Stroke deals 3 damage to target
creature or planeswalker. If this spell was cast
for its {3}{r} flashback cost, it also deals 3
damage to that permanent's controller. If this
spell was cast for its {4}{r}{r} flashback cost, it
also deals 3 damage to another target creature
or planeswalker.
Flashback {3}{r} or {4}{r}{r} (You may cast this card
from your graveyard for its flashback cost. Then exile
it.)