How can you create a combo with Spawnsire of Ulamog, Earthcraft?
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[START OF COMBO]This combo can be formed with Spawnsire of Ulamog, Earthcraft

Color identity: G
Mana cost: {4} from various sources
Steps:
  1. Pay {4} to activate Spawnsire of Ulamog's first activated ability, creating two 0/1 colorless Eldrazi Spawn creature tokens.
  2. Use Earthcraft's activated ability on an Eldrazi spawn token, tapping it and untapping a basic land you control.
  3. Float the mana from that basic land and untap it again with the other Eldrazi spawn token.
  4. With {2} floating, sacrifice both of the Eldrazi spawn to make {2} more.
  5. Use the {4} you just made to again use Spawnsire of Ulamog's ability and repeat the loop.[END OF COMBO STEPS]

Result:
  - 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
  - At least one of those sources should be a basic land.
[END OF COMBO PREREQUISITES]
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