Walking Ballista [Aether Revolt Prerelease Promos] 031 and can only be activated

and can only be activated during your turn

Set: Maximum Gold Card type: Effect Monster Rarity: Gold Rare Attack: 500 Defense: 1600 If this card is Normal or Special Summoned: You can target 1 Level 4 or lower "Dragonmaid" monster in your GY

Set: Storm of Ragnarok Card type: Synchro/Effect Monster Rarity: Ultra Rare Attack: 3300 Defense: 3000 1 "Nordic Alfar" Tuner + 2 or more non-Tuner monsters

Set: Battle Pack 2: War of the Giants Card type: Effect Monster Rarity: Mosaic Rare Attack: 2800 Defense: 2000 When this card destroys a monster by battle and sends it to the Graveyard: Gain Life Points equal to the original ATK of that destroyed monster in the Graveyard

move the doom counter one numeral to the left

Walking Ballista [Aether Revolt Prerelease Promos] 031 and can only be activatedSet: 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.