How can you create a combo with Colfenor, the Last Yew, Gutter Grime, Walking Ballista, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Colfenor, the Last Yew, Gutter Grime, Walking Ballista, Altar of Dementia

Color identity: WBG
Mana cost: 
Steps:
  1. Cast Walking Ballista by paying {0}.
  2. Walking Ballista enters the battlefield and dies as a state-based action due to having zero toughness.
  3. Gutter Grime triggers, putting a slime counter on it and creating a X/X Ooze creature token.
  4. Activate Altar of Dementia by sacrificing the Ooze.
  5. When the Ooze dies, Colfenor triggers, returning Walking Ballista from your graveyard to the battlefield.
  6. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the Ooze's power.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Colfenor, the Last Yew must be on the battlefield
  - Gutter Grime must be on the battlefield
  - Walking Ballista must be in your hand
  - Altar of Dementia must be on the battlefield
[END OF COMBO PREREQUISITES]
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