Armor Wars is a rare Enchantment — Saga card from Marvel Super Heroes (MSH), collector number 203. Current market price: $0.25 (foil $0.34), TCGplayer market prices via Scryfall.
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — You may draw a card for each artifact you control. If you do, each opponent draws a card. II — Artifact spells you cast this turn cost {1} less to cast. III — This Saga deals X damage to target opponent, where X is the greatest mana value among artifacts you control.