Agatha's Soul Cauldron + Walking Ballista + Yahenni, Undying Partisan

B identity

Commander legal

The 3 combo pieces

• Agatha's Soul Cauldron
• Walking Ballista
• Yahenni, Undying Partisan

What must be in place

Yahenni has at least one +1/+1 counter on it.
You have a way to give Yahenni deathtouch.

How to execute it

1. Give Yahenni deathtouch, if needed.
2. Activate Yahenni using Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to a creature an opponent controls, and destroying it due to Yahenni's deathtouch.
3. Yahenni triggers, putting a +1/+1 counter on it.
4. Repeat from step 2 as desired.
5. If you can give Yahenni deathtouch indefinitely, you may repeat this loop whenever a creature enters the battlefield under an opponent's control.

What the combo produces

• Destroy all creatures opponents control
• Destroy each creature that enters the battlefield under an opponent's control
• Lock