Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Fiery Emancipation + Walking Ballista

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Fiery Emancipation

Walking Ballista

How it works

1. Activate Anti-Venom using Walking Ballista's ability by removing a +1/+1 counter from it, targeting itself and putting three +1/+1 counters on it due to its replacement effect and Fiery Emancipation.
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 ingenious loop relies on Agatha's Soul Cauldron to grant Walking Ballista's activated ability to Anti-Venom, Horrifying Healer, transforming the symbiote into a lethal turret. When Anti-Venom uses this newfound ability to ping itself, Fiery Emancipation steps in to triple that incoming damage, which Anti-Venom's own replacement effect turns into a net gain of +1/+1 counters rather than harm. By cycling between removing a counter to deal damage and replacing that self-inflicted damage with a surge of new counters, you can endlessly repeat the process to generate infinitely large creatures and obliterate any target.