How can you create a combo with Jegantha, the Wellspring, Necrotic Ooze, Horseshoe Crab?
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[START OF COMBO]This combo can be formed with Jegantha, the Wellspring, Necrotic Ooze, Horseshoe Crab

Color identity: WUBRG
Mana cost: 
Steps:
  1. Activate Necrotic Ooze using Jegantha's ability by tapping it, adding {W}{U}{B}{R}{G} that cannot be spent to pay generic mana costs.
  2. Activate Necrotic Ooze using Horseshoe Crab's ability by paying {U}, untapping Necrotic Ooze.
  3. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite red mana that cannot be spent to pay generic mana costs
  - Infinite black mana that cannot be spent to pay generic mana costs
  - Infinite green mana that cannot be spent to pay generic mana costs
  - Infinite white mana that cannot be spent to pay generic mana costs[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Jegantha, the Wellspring must be in the graveyard
  - Necrotic Ooze must be on the battlefield
  - Horseshoe Crab must be in the graveyard
  - Necrotic Ooze does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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