How can you create a combo with Necrotic Ooze, Devoted Druid, Grim Poppet?
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[START OF COMBO]This combo can be formed with Necrotic Ooze, Devoted Druid, Grim Poppet

Color identity: BG
Mana cost: 
Steps:
  1. Activate Necrotic Ooze using Devoted Druid's first ability by tapping it, adding {G}.
  2. Activate Necrotic Ooze using Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
  3. Activate Necrotic Ooze using Grim Poppet's ability by removing a -1/-1 counter from it, targeting any other creature.
  4. Holding priority, activate Necrotic Ooze using Devoted Druid's first ability by tapping it, adding {G}.
  5. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite -1/-1 counters
  - Infinite green mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Necrotic Ooze must be on the battlefield
  - Devoted Druid must be in the graveyard
  - Grim Poppet must be in the graveyard
  - Necrotic Ooze does not have summoning sickness.There is at least one additional creature on the battlefield.
[END OF COMBO PREREQUISITES]
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