Kureiji Ollie

Graveyard Ninjutsu {b}{r} ({b}{r}: Sacrifice an
unblocked attacker you control: Put this card onto the
battlefield from your graveyard tapped and attacking.)
Menace, deathtouch
As long as Ollie is on the battlefield or in your
graveyard, creatures in your graveyard have
graveyard ninjutsu. Its graveyard ninjutsu cost
is equal to its casting cost.