Vigor + Walking Ballista + Loading Zone

Vigor

Walking Ballista

Loading Zone

How it works

1. Activate Walking Ballista by removing a +1/+1 counter on it, targeting itself, but putting two +1/+1 counters on it due to Vigor.
2. Activate Walking Ballista by removing a +1/+1 counter on it, dealing 1 damage to any target.
3. Repeat.

This explosive interaction centers on Walking Ballista's ability to ping itself, which normally would whittle its own health away. However, with Vigor on the battlefield, any damage dealt to your creatures is safely prevented and converted into +1/+1 counters instead. To push this loop into overdrive, Loading Zone doubles every single counter put onto your creatures, ensuring that the self-inflicted damage generates a net surplus of growth. By removing one counter to ping Walking Ballista, you trigger Vigor to prevent the damage and Loading Zone to multiply the resulting counters, leaving you with an ever-growing machine capable of dealing infinite damage to any target.