$14.33
Walking Ballista 
Artifact Creature — Construct
Aether Revolt Rare
Walking Ballista enters the battlefield with X +1/+1 counters on it.
: Put a +1/+1 counter on Walking Ballista.
Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target.
: Put a +1/+1 counter on Walking Ballista.Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target.
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#181 — Illus. Daniel Ljunggren