How can you create a combo with Blossoming Tortoise, Dryad Arbor, Infinite Reflection, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Blossoming Tortoise, Dryad Arbor, Infinite Reflection, Altar of Dementia

Color identity: GU
Mana cost: 
Steps:
  1. Play Dryad Arbor.
  2. When Dryad Arbor enters the battlefield as a copy of Blossoming Tortoise due to Infinite Reflection, it triggers.
  3. Holding priority, activate Altar of Dementia by sacrificing Dryad Arbor, causing target player to mill cards equal to Dryad Arbor's power.
  4. Resolve the Dryad Arbor trigger from step 2, causing you to mill three cards and return Dryad Arbor from your graveyard to the battlefield.
  5. Repeat from step 2.[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:
  - Blossoming Tortoise must be on the battlefield
  - Dryad Arbor must be in your hand
  - Infinite Reflection must be on the battlefield
  - Altar of Dementia must be on the battlefield
  - Infinite Reflection attached to Blossoming Tortoise.
[END OF COMBO PREREQUISITES]
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