Altaïr Ibn-La'Ahad

Although the tokens enter the battlefield attacking, they were never declared as attacking creatures. Abilities that trigger whenever a creature attacks won't trigger when they enter the battlefield attacking.

If an exiled card has {X} in its mana cost, X is 0.

Each of the tokens copies exactly what was printed on the card in exile and nothing else. They don't copy any information about the object the card was before it was exiled.