Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Walking Ballista + Sawhorn Nemesis

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Walking Ballista

Sawhorn Nemesis

How it works

1. 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 Sawhorn Nemesis.
2. Activate Anti-Venom using Walking Ballista's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
3. Repeat.

This clever loop turns Walking Ballista into a self-sustaining engine by utilizing Agatha's Soul Cauldron to grant it the activated abilities of Anti-Venom, Horrifying Healer. Once Anti-Venom's damage-prevention and counter-doubling ability is shared with Walking Ballista, removing a counter to ping a target instead triggers a net gain of counters when directed at Anti-Venom, especially with Sawhorn Nemesis doubling the damage dealt to your own permanent. This exponential growth generates infinite damage and infinite +1/+1 counters to instantly close out the game.