Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Walking Ballista + Quest for Pure Flame

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Walking Ballista

Quest for Pure Flame

How it works

1. Activate Quest for Pure Flame by removing four quest counters from it and sacrificing it, doubling the damage sources you control will deal this turn.
2. Activate Anti-Venom using Walking Ballista's ability by removing a +1/+1 counter from it, targeting itself and putting two +1/+1 counters on it due to its replacement effect and Quest for Pure Flame.
3. Activate Anti-Venom using Walking Ballista's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
4. Repeat from step 2.

By feeding Walking Ballista into Agatha's Soul Cauldron, you grant Anti-Venom, Horrifying Healer the crucial ability to ping targets by removing its own +1/+1 counters. When Anti-Venom targets itself with this damage, its replacement effect prevents the harm and doubles the resulting counters placed upon it, a multiplier further supercharged if Quest for Pure Flame has been activated to double the damage dealt. This creates a self-sustaining loop that continuously generates infinite +1/+1 counters and infinite damage to close out the game.