How can you create a combo with Mairsil, the Pretender, Pack Rat, Asmodeus the Archfiend, Overeager Apprentice, Training Grounds?
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[START OF COMBO]This combo can be formed with Mairsil, the Pretender, Pack Rat, Asmodeus the Archfiend, Overeager Apprentice, Training Grounds

Color identity: UBR
Mana cost: {B}{B}{B}{B}
Steps:
  1. Activate Mairsil using Asmodeus' first ability by paying {B}{B}{B}, causing you to draw seven cards.
  2. Activate Mairsil using Pack Rat's ability by paying {B} and discarding a card.
  3. Holding priority, activate Mairsil by discarding a card and sacrificing it, adding {B}{B}{B}.
  4. Resolve the Mairsil ability from step 2, creating a token copy of Mairsil.
  5. Repeat from step 2 one additional time.
  6. Repeat from step 1.[END OF COMBO STEPS]

Result:
  - Infinite draw triggers
  - Near-infinite black mana
  - Near-infinite card draw
  - Near-infinite death triggers
  - Near-infinite enters the battlefield
  - Near-infinite looting
  - Near-infinite leaves the battlefield
  - Near-infinite sacrifice triggers
  - Near-infinite self-discard triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mairsil, the Pretender must be on the battlefield
  - Pack Rat must be exiled
  - Asmodeus the Archfiend must be exiled
  - Overeager Apprentice must be exiled
  - Training Grounds must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant