Walking Ballista
Walking Ballista {X}{X}
Artifact Creature - Construct
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 target creature or player.
Latest set: [AER] Aether Revolt (R)