Sakura, Crimson Death

Ninjutsu {3}{r} ({3}{r}, Return an unblocked
attacker you control to hand: Put this card onto
the battlefield from your hand tapped and
attacking.)

Sakura, Crimson Death gets +3/+0 as long as it's attacking and isn't blocked.

{r}{r},{t}: Sakura, Crimson Death deals 4 damage
to target creature.