How can you create a combo with Ratadrabik of Urborg, Boonweaver Giant, In Bolas's Clutches, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Ratadrabik of Urborg, Boonweaver Giant, In Bolas's Clutches, Altar of Dementia

Color identity: WUB
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Boonweaver Giant.
  2. When Boonweaver Giant dies as a legendary creature due to In Bolas's Clutches, Ratadrabik of Urborg triggers, creating a token copy of Boonweaver Giant that is a 2/2 Zombie in addition to its other types.
  3. When the Boonweaver Giant token enters the battlefield, it triggers, returning In Bolas's Clutches from your graveyard to the battlefield attached to the token.
  4. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Boonweaver Giant's power.
  5. 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[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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