Myrel, Shield of Argive [The Brothers' War Prerelease Promos] March of the Machine Prerelease Promos and has "Whenever a player

and has "Whenever a player casts a spell or a creature attacks

Gaea Incarnate

Equip {1} ({1}: Attach to target creature you control

Set: The Lord of the Rings: Tales of Middle-Earth Commander Type: Creature — Dragon Rarity: Rare Cost: {7}{R}{R} This spell costs x less to cast

Set: Unknown Event Type: Sorcery Rarity: Common Cost: {1}{U} Choose One —

Myrel, Shield of Argive [The Brothers' War Prerelease Promos] March of the Machine Prerelease Promos and has "Whenever a playerSet: The Brothers' War Prerelease Promos Type: Legendary Creature Human Soldier Rarity: Mythic Cost: {3}{W} During your turn, your opponents can't cast spells or activate abilities of artifacts, creatures, or enchantments. Whenever Myrel, Shield of Argive attacks, create X 1 1 colorless Soldier artifact creature tokens, where X is the number of Soldiers you control.