How can you create a combo with Incubation Druid, Umbral Mantle, Leyline of Abundance?
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[START OF COMBO]This combo can be formed with Incubation Druid, Umbral Mantle, Leyline of Abundance

Color identity: G
Mana cost: 
Steps:
  1. Activate Incubation Druid's first ability by tapping it, adding three mana of any color a land you control could produce.
  2. Leyline of Abundance triggers, adding {G}.
  3. Activate Incubation Druid by paying {3} and untapping it, giving itself +2/+2 until end of turn.
  4. Repeat.
  5. Once you have infinite {G}, you may activate Leyline of Abundance's ability to put infinite +1/+1 counters on each creature you control.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters
  - Infinitely large Incubation Druid until end of turn
  - Infinite mana lands you control can produce[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Umbral Mantle attached to Incubation Druid.
  - Incubation Druid does not have summoning sickness.
  - Incubation Druid has at least one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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