Togen, Daimyo of the Dead

Menace
Grave Ninjutsu {2}{u}{b} ({2}{u}{b}, Return an unblocked attacker you control to hand:
Put this card onto the battlefield from your graveyard tapped and attacking.)
Each Zombie and Ninja creature card in your graveyard that doesn't have grave ninjutsu has grave ninjutsu. The grave ninjutsu cost for each
of those cards is equal to its mana cost.