Walking Ballista [Aether Revolt Prerelease Promos] 220 or triggered ability

or triggered ability

where X is the exiled card's mana value

Set: The Lost Millennium Card type: Ritual/Effect Monster Rarity: Ultimate Rare Attack: 2500 Defense: 1500 This card can only be Ritual Summoned with the Ritual Spell Card

Set: Champion Pack 8 Card type: Normal Trap Rarity: Super Rare Declare 1 card name

Walking Ballista [Aether Revolt Prerelease Promos] 220 or triggered abilitySet: Aether Revolt Prerelease Promos Type: Artifact Creature Construct Rarity: Rare Cost: {X}{X} Walking Ballista enters the battlefield with X +1 +1 counters on it. {4}: Put a +1 +1 counter on Walking Ballista. Remove a +1 +1 counter from Walking Ballista: It deals 1 damage to any target.