Origin of the Avengers (MSH)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
[I] Scry 2.
[II] You may put a Hero creature card with mana value 3 or less from your hand onto the battlefield. If you don't, draw a card.
[III] Put a +1/+1 counter on each creature you control.