Whenever Ballista Charger attacks, it deals 1 damage to any target.
Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.)
XW, T: Ballista Squad deals X damage to target attacking or blocking creature.
T: Heavy Ballista deals 2 damage to target attacking or blocking creature.
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.