How can you create a combo with Selvala, Heart of the Wilds, Crab Umbra?
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[START OF COMBO]This combo can be formed with Selvala, Heart of the Wilds, Crab Umbra

Color identity: GU
Mana cost: {G}
Steps:
  1. Activate Selvala by paying {G} and tapping it, adding at least {2}{G}{U}.
  2. Activate Crab Umbra by paying {2}{U}, untapping Selvala.
  3. Repeat.
  4. If you control a creature with power 5 or greater, this combo nets infinite colored mana.[END OF COMBO STEPS]

Result:
  - Infinite colored mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Crab Umbra attached to Selvala.
  - You control a creature with power 4 or greater.
  - Selvala does not have summoning sickness.
[END OF COMBO PREREQUISITES]
assistant