How can you create a combo with Twilight Drover, Phyrexian Altar, Primal Vigor?
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[START OF COMBO]This combo can be formed with Twilight Drover, Phyrexian Altar, Primal Vigor

Color identity: GW
Mana cost: {2}{W}
Steps:
  1. Activate Twilight Drover by paying {2}{W} and removing a +1/+1 counter from it, creating four 1/1 Spirit creature tokens with flying.
  2. Activate Phyrexian Altar three times by sacrificing three Spirits, adding {2}{W}.
  3. When the Spirits die, Twilight Drover triggers three times, putting six +1/+1 counters on itself.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Twilight Drover
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Twilight Drover has at least one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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