Hayabusa, the Ultimate Ninja

Ninjutsu {2}{u}{b} ({2}{u}{b}, Return an unblocked attacker you control to your hand: Put this card onto
the battlefield from your hand tapped and attacking.)
Hayabusa, the Ultimate Ninja enters the
battlefield with X +1/+1 counters on it, where X
is the number of ninjas you control plus the
number of ninjas in your graveyard.
"A storm is brewing..."
— Ryu Hayabusa