Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Walking Ballista + Taii Wakeen, Perfect Shot

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Walking Ballista

Taii Wakeen, Perfect Shot

How it works

1. Activate Taii Wakeen by paying 1 and tapping it, increasing the amount of damage sources you control deal this turn by 1.
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 Taii Wakeen.
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.

This engine lets you turn a single +1/+1 counter into a growing tempest of damage and buffs, utilizing Agatha's Soul Cauldron to grant Walking Ballista's activated ability directly to Anti-Venom, Horrifying Healer. Because Anti-Venom prevents any damage dealt to itself and converts it into matching +1/+1 counters instead, every self-inflicted shot ends up leaving you further ahead on counters than when you started. Meanwhile, Taii Wakeen, Perfect Shot stands ready to juice those damage numbers even higher, ensuring the loop quickly escalates out of control.