Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Walking Ballista + Ozolith, the Shattered Spire

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Walking Ballista

Ozolith, the Shattered Spire

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 Ozolith, the Shattered Spire.
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 revolves around Agatha's Soul Cauldron, which gifts our creatures the activated abilities of any exiled creature cards while letting us spend mana of any color to use them. By exiling Walking Ballista into the Cauldron, we grant its activated ping-and-counter abilities to our creatures—provided they have +1/+1 counters on them. Ozolith, the Shattered Spire ensures that counter-based engines output extra value by increasing the number of +1/+1 counters placed on our permanents, while Anti-Venom, Horrifying Healer acts as the vessel that absorbs damage, converts it into massive counter growth, and easily loops back into the battlefield from the graveyard if recast.