Interplanar Strangler

Ninjutsu {3}{u/b} ({3}{u/b}, Return an unblocked attacker
you control to hand: Put this card onto the battlefield
from your hand tapped and attacking.)
When Interplanar Strangler enters the battlefield,
it deals X damage to target player, where X is the
number of Rogues and Samurai you control.
Return Interplanar Lurker to your hand : You
lose 4 life and draw a card.