>>96821293
Yes. All Altair cares about is the Memory counter. He can only give the Memory Counter to creatures that have the Assassin type while in they are in the Graveyard. However he does not need to be the one to give the counter. You can use the Animus to put Memory Counters on any Legendary in your Graveyard and Altair can summon it even if it's not an Assassin.