How can you create a combo with Athreos, Shroud-Veiled, Enduring Bondwarden, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Athreos, Shroud-Veiled, Enduring Bondwarden, Altar of Dementia

Color identity: WB
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Enduring Bondwarden.
  2. When Enduring Bondwarden dies, it and Athreos' third ability trigger.
  3. Resolve the Enduring Bondwarden trigger, putting all counters from it onto another nontoken creature you control.
  4. Resolve the Athreos trigger, returning Enduring Bondwarden from your graveyard to the battlefield.
  5. When Enduring Bondwarden enters the battlefield, its backup ability triggers, putting a +1/+1 counter on the creature who had a coin counter placed on it, and giving it the printed ability until end of turn.
  6. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Enduring Bondwarden's power.
  7. Activate Altar of Dementia by sacrificing the nontoken creature with a coin counter on it.
  8. When the creature dies, it and Athreos' third ability trigger.
  9. Resolve the creature's trigger, putting all counters from it onto Enduring Bondwarden .
  10. Resolve the Athreos trigger, returning the creature from your graveyard to the battlefield.
  11. Resolve the Altar of Dementia ability from step 7, causing target player to mill cards equal to the sacrificed creature's power.
  12. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on target creature you control
  - 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
  - You control at least one other nontoken creature.
  - Enduring Bondwarden has at least one coin counter on it.
[END OF COMBO PREREQUISITES]
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