Cauldron of Souls + Corridor Monitor + Cathars' Crusade + Goblin Bombardment

Cauldron of Souls
Corridor Monitor
Cathars' Crusade
Goblin Bombardment

Requires
Cauldron of Souls must be on the battlefield. Corridor Monitor must be on the battlefield. Cathars' Crusade must be on the battlefield. Goblin Bombardment must be on the battlefield. Corridor Monitor does not have a -1/-1 counter on it.
Steps
  1. Activate Cauldron of Souls by tapping it, giving Corridor Monitor persist until end of turn.
  2. Activate Goblin Bombardment by sacrificing Corridor Monitor.
  3. When Corridor Monitor dies, its persist ability triggers, returning itself from your graveyard to the battlefield with a -1/-1 counter on it.
  4. When Corridor Monitor enters the battlefield, it and Cathars' Crusade trigger.
  5. Resolve the Corridor Monitor trigger, untapping Cauldron of Souls.
  6. Resolve the Cathars' Crusade trigger, putting a +1/+1 counter on each creature you control.
  7. Resolve the Goblin Bombardment ability from step 2, dealing 1 damage to any target.
  8. Repeat.
Results
Infinite damage. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite +1/+1 counters.

Cayth, Famed Mechanist
0.15% of 1315 decks 2 decks
Creatures
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100% of 2 decks +100% synergy
Witty Roastmaster
100% of 2 decks +97% synergy
Oltec Matterweaver
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Pyre-Sledge Arsonist
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