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

   Prerequisites

What do I need to start this combo?
Walking Ballista in exile (Walking Ballista exiled by Agatha's Soul Cauldron in exile).
Ob Nixilis and Agatha's Soul Cauldron on the battlefield.
Ob Nixilis has at least one +1/+1 counter on it.

   Steps

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

   Results

What do I get from this combo?
Exile your library
Infinite damage
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