Akuma of the Four Clans

Commander ninjitsu {u}{b}{r} ({u}{b}{r}, Return an unblocked attacker you control to your hand: Put this
card onto the battlefield from your hand or the
command zone tapped and attacking.)
Whenever a Ninja or a Rogue you control deals
combat damage to a player, you get a Ki counter.
Pay five Ki counters: Gain control of target
nonland permanent. Activate this ability only
during your turn.