Agatha's Soul Cauldron + Anti-Venom, Horrifying Healer + City on Fire + Walking Ballista

RW identity

Commander legal

The 4 combo pieces

• Agatha's Soul Cauldron
• Anti-Venom, Horrifying Healer
• City on Fire
• Walking Ballista

How to execute it

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 City on Fire.
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.

What the combo produces

• Infinite +1/+1 counters on a creature
• Infinite damage