Tyrant of Discord [Avacyn Restored] Alien Zombie Soldier choose one that hasn't been

choose one that hasn't been chosen:

When a legendary creature enters the battlefield under your control

Whenever you roll a blank on the planar die

Set: Summer Magic / Edgar Type: Artifact Creature — Shapeshifter Rarity: Rare Cost: {4} As Primal Clay enters the battlefield

Set: The Brothers' War Type: Enchantment Rarity: Rare Cost: {1}{R}{R} If a red or artifact source you control would deal damage to an opponent or a permanent an opponent controls

Tyrant of Discord [Avacyn Restored] Alien Zombie Soldier choose one that hasn't beenSet: Avacyn Restored Type: Creature Elemental Rarity: Rare Cost: {4}{R}{R}{R} When Tyrant of Discord enters the battlefield, target opponent chooses a permanent they control at random and sacrifices it. If a nonland permanent is sacrificed this way, repeat this process.