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.
Near Mint - $7.70
Lightly Played - $6.20
Moderately Played - $5.40
Heavily Played - $4.60
Damaged - $3.90
Near Mint Spanish - $7.70
Lightly Played Spanish - $6.20
Moderately Played Spanish - $5.40
Heavily Played Spanish - $4.60
Damaged Spanish - $3.90