Walking Ballista [Double Masters] Mirrodin Besieged then you gain 1 life

then you gain 1 life for each permanent of that color

Set: Judge Gift Cards 2016 Type: Creature — Kor Artificer Rarity: Rare Cost: {1}{W} When Stoneforge Mystic enters the battlefield

Set: Ravnica Allegiance Type: Land — Plains Swamp Rarity: Rare ({T}: Add {W} or {B}

where X is the total power of creatures you control

Set: International Collectors’ Edition Type: Sorcery Rarity: Rare Cost: {1}{W} Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest

Walking Ballista [Double Masters] Mirrodin Besieged then you gain 1 lifeSet: Double Masters 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.