Walking Ballista [Aether Revolt Prerelease Promos] Planar Chaos They become 6/6 Elemental creatures

They become 6/6 Elemental creatures

Set: San Diego Comic-Con 2015 Type: Legendary Creature — Human Soldier Rarity: Mythic Cost: {W} At end of combat

Sacrifice this artifact: Draw a card

Set: Classic Sixth Edition Type: Instant Rarity: Uncommon Cost: {U} Search your library for an instant or sorcery card

Walking Ballista [Aether Revolt Prerelease Promos] Planar Chaos They become 6/6 Elemental creaturesSet: 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.