How can you create a combo with Worm Harvest, Groundskeeper, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Worm Harvest, Groundskeeper, Phyrexian Altar

Color identity: BG
Mana cost: {2}{B/G}{B/G}{B/G}
Steps:
  1. Cast Worm Harvest for its retrace cost by paying {2}{B/G}{B/G}{B/G} and discarding a land card from your hand, creating at least eight 1/1 Worm creature tokens.
  2. Activate Phyrexian Altar seven times by sacrificing seven Worm tokens, adding {3}{B/G}{B/G}{B/G}{G}.
  3. Activate Groundskeeper by paying {1}{G}, returning a basic land card to your hand from your graveyard.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite sacrifice triggers
  - Infinite self-discard triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Worm Harvest must be in the graveyard
  - Groundskeeper must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - You have at least seven land cards in your graveyard.
  - You have a land card in hand.
  - You have a basic land card either in hand or in your graveyard.
[END OF COMBO PREREQUISITES]
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