How can you create a combo with Ao, the Dawn Sky, Workhorse, Nim Deathmantle, Phyrexian Altar, Doubling Season?
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[START OF COMBO]This combo can be formed with Ao, the Dawn Sky, Workhorse, Nim Deathmantle, Phyrexian Altar, Doubling Season

Color identity: GW
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Ao, adding one mana of any color.
  2. Ao dies, triggering itself and Nim Deathmantle.
  3. Resolve the Ao trigger, putting four +1/+1 counters on each creature and Vehicle you control.
  4. Activate Workhorse by removing four +1/+1 counters from it, adding {C}{C}{C}{C}.
  5. Resolve the Nim Deathmantle trigger, causing you to pay {4} to return Ao from your graveyard to the battlefield, and then attach Nim Deathmantle to it.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on all creatures you control except Ao
  - Infinite +1/+1 counters on all Vehicles you control
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Put all nonland permanents with mana value four or less from your library onto the battlefield[END OF COMBO RESULT][END OF COMBO]

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