Kazuki, Future Ninja

Doublestrike, Hexproof
Ninjitsu {4}{b}{r} ({4}{b}{r}, Return an unblocked
attacker you control to hand: Put this card into play
from your hand tapped and attacking.)
When this creature deals combat damage to a
player, you may cast an artifact from your hand without paying its manacost, as though it has
flash. When this creature deals combat damage
to a creature, exile it.
{4}: Creatures cannot block Kazuki, Future Ninja
until end of turn.