Myrel, Shield of Argive is a mythic Legendary Creature — Human Soldier card from The Brothers' War Promos (PBRO), collector number 18p. Current market price: $17.75 (foil $19.99), TCGplayer market prices via Scryfall.
During your turn, your opponents can't cast spells or activate abilities of artifacts, creatures, or enchantments. Whenever Myrel attacks, create X 1/1 colorless Soldier artifact creature tokens, where X is the number of Soldiers you control.