Altaïr Ibn-La'Ahad

First strike

Whenever Altaïr Ibn-La'Ahad attacks, exile up to
one target Assassin creature card from your
graveyard with a memory counter on it. Then for
each creature card you own in exile with a memory
counter on it, create a tapped and attacking token
that's a copy of it. Exile those tokens at end of
combat.