How can you create a combo with Sigil of the New Dawn, Deathrender, Altar of Dementia, Peregrine Drake?
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[START OF COMBO]This combo can be formed with Sigil of the New Dawn, Deathrender, Altar of Dementia, Peregrine Drake

Color identity: WU
Mana cost: {1}{W}
Steps:
  1. Activate Altar of Dementia by sacrificing Peregrine Drake.
  2. Sigil of the New Dawn and Deathrender trigger.
  3. Resolve Sigil of the New Dawn's trigger, paying {1}{W} to return Peregrine Drake from your graveyard to your hand.
  4. Resolve Deathrender's trigger, putting Peregrine Drake from your hand onto the battlefield and attaching Deathrender to it.
  5. Peregrine Drake enters the battlefield, triggering itself, untapping up to five lands you control that can produce at least {2}{W}.
  6. Resolve the Altar of Dementia ability from step 1, causing target player to mill four cards.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana lands you control can produce
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Deathrender attached to Peregrine Drake.
  - You control lands that produce at least {2}{W}.
[END OF COMBO PREREQUISITES]
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