Agatha's Soul Cauldron + Sengir, the Dark Baron + Walking Ballista

B identity

Commander legal

The 3 combo pieces

• Agatha's Soul Cauldron
• Sengir, the Dark Baron
• Walking Ballista

What must be in place

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

How to execute it

1. Give Sengir deathtouch, if needed.
2. Activate Sengir using Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to any creature an opponent controls, and killing it due to Sengir's deathtouch.
3. When the creature dies, Sengir's first ability triggers, putting two +1/+1 counters on it.
4. Repeat from step 2 as desired.

What the combo produces

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