Ob Nixilis, Captive Kingpin + Agatha's Soul Cauldron + Walking Ballista

Prerequisites

• Ob Nixilis has at least one +1/+1 counter on it.

Steps

1. 1Activate Ob Nixilis using Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to an opponent.
2. 2Ob Nixilis triggers, putting a +1/+1 counter on itself and exiling the top card of your library.
3. 3Repeat.

Effects

• Exile your library
• Infinite damage