Walking Ballista [Aether Revolt Prerelease Promos] XY117 but their effects are negated

but their effects are negated

remove all +1 [Power] counters from Duskblade

Set: Gym Challenge Unlimited Type: Colorless Rarity: Holo Rare Retreat cost: Colorless

Set: New Phyrexia Type: Legendary Creature — Phyrexian Praetor Rarity: Mythic Cost: {6}{G}{G} Trample

Walking Ballista [Aether Revolt Prerelease Promos] XY117 but their effects are negatedSet: 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.