How can you create a combo with Xantcha, Sleeper Agent, Mind Over Matter, Grim Monolith?
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[START OF COMBO]This combo can be formed with Xantcha, Sleeper Agent, Mind Over Matter, Grim Monolith

Color identity: UBR
Mana cost: 
Steps:
  1. Activate Grim Monolith's first ability by tapping it, adding {C}{C}{C}.
  2. Activate Xantcha by paying {3}, causing its controller to lose 2 life and you to draw a card.
  3. Activate Mind over Matter by discarding a card, untapping Grim Monolith.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite draw triggers
  - Infinite lifeloss for target opponent
  - Infinite looting
  - Infinite self-discard triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Xantcha on the battlefield under an opponent's control.
[END OF COMBO PREREQUISITES]
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