Illusionary Mask (Retro) [30th Anniversary Edition] Pioneer Set: March of the Machine:

Set: March of the Machine: The Aftermath Type: Legendary Artifact Creature — Golem Rarity: Mythic Cost: {5} Karn

Whenever another nontoken creature enters the battlefield under your control

Though it may take an eternity

Each player who doesn't win the subgame loses half their life

Illusionary Mask (Retro) [30th Anniversary Edition] Pioneer Set: March of the Machine:Set: 30th Anniversary Edition Type: Artifact Rarity: Rare Cost: {2} {X}: You may choose a creature card in your hand whose mana cost could be paid by some amount of, or all of, the mana you spent on {X}. If you do, you may cast that card face down as a 2 2 creature spell without paying its mana cost. If the creature that spell becomes as it resolves has not been turned face up and would assign or deal damage, be dealt damage, or become tapped, instead