Walking Ballista and Vraska Infinite Damage

Step 1: Have Walking Ballista on the battlefield with at least one +1/+1 counter.

Step 2: Have Vraska, Swarm's Eminence on the battlefield to give Ballista deathtouch.

Step 3: Use Animation Module to add a +1/+1 counter to Walking Ballista whenever you remove one.

Step 4: Remove a +1/+1 counter from Walking Ballista to deal 1 damage to any target, triggering Animation Module.

Step 5: Pay to use Animation Module's ability to add a +1/+1 counter back onto Walking Ballista.

Step 6: Repeat steps 4 and 5 for infinite damage.