Heliod Walking Ballista Infinite Damage

Step 1: Ensure both Heliod, Sun-Crowned and Walking Ballista are on the battlefield.

Step 2: Walking Ballista should have at least one +1/+1 counter on it.

Step 3: Activate Heliod's ability to give Walking Ballista lifelink.

Step 4: Remove a +1/+1 counter from Walking Ballista to deal 1 damage to any target. This triggers lifelink, gaining you 1 life.

Step 5: Heliod's ability triggers from the lifelink gain, allowing you to put a +1/+1 counter back on Walking Ballista.

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