ACR-36 Origin of the Hidden Ones

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I - This Saga deals 4 damage to any target.
II - Create two 1/1 black Assassin creature tokens with menace.
III - Whenever an Assassin you control attacks this turn, create a 1/1 black Assassin creature token with menace that's tapped and attacking.