Anti-Venom, Horrifying Healer + Agatha's Soul Cauldron + Hardened Scales + Walking Ballista

Anti-Venom, Horrifying Healer

Agatha's Soul Cauldron

Hardened Scales

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 two +1/+1 counters on it due to its replacement effect and Hardened Scales.
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 transforms your creatures into a self-sustaining artillery battery by feeding Walking Ballista's lethal activation into Agatha's Soul Cauldron. With Walking Ballista exiled inside the Cauldron and granting its activated abilities to your creatures, Anti-Venom, Horrifying Healer gains the power to ping any target at the cost of a counter. Meanwhile, Hardened Scales ensures that whenever damage prevention adds +1/+1 counters to Anti-Venom, you actually net an extra counter every single time. The result is an escalating engine that endlessly fuels its own ammunition for infinite damage.