Origin of the Hidden Ones

(3) (R) 

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
[I] Origin of the Hidden Ones 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.

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