Walking Ballista [Aether Revolt] Desert {T}: Prevent all combat damage

{T}: Prevent all combat damage that would be dealt by target creature this turn

If damage is prevented this way

{T}: Exchange target opponent's life total with Tree of Perdition's toughness

None know if this Giant is the result of aberrant magics

You don't put a legendary permanent into a graveyard if you control two with the same name

Walking Ballista [Aether Revolt] Desert {T}: Prevent all combat damageSet: Aether Revolt 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.