How can you create a combo with Grimgrin, Corpse-Born, Necrotic Ooze, Thraben Doomsayer?
user
[START OF COMBO]This combo can be formed with Grimgrin, Corpse-Born, Necrotic Ooze, Thraben Doomsayer

Color identity: WUB
Mana cost: 
Steps:
  1. Activate Necrotic Ooze using Thraben Doomsayer's ability by tapping it, creating a 1/1 Human creature token.
  2. Activate Necrotic Ooze using Grimgrin's ability by sacrificing the Human, untapping Necrotic Ooze and putting a +1/+1 counter on it.
  3. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Necrotic Ooze
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Grimgrin, Corpse-Born must be in the graveyard
  - Necrotic Ooze must be on the battlefield
  - Thraben Doomsayer must be in the graveyard
  - Necrotic Ooze does not have summoning sickness.
[END OF COMBO PREREQUISITES]
assistant