Origin of Captain America is a uncommon Enchantment — Saga card from Marvel Super Heroes Commander (MSC), collector number 605. Current market price: $0.32 (foil $0.84), TCGplayer market prices via Scryfall.
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — Put a +1/+1 counter on target creature you control. It gains first strike and vigilance until end of turn. II — Create a colorless Equipment artifact token named Sturdy Shield with "Equipped creature gets +1/+2" and equip {2}. III — Tap up to one target creature and put a stun counter on it.