How can you create a combo with Robaran Mercenaries, Grimgrin, Corpse-Born, Krenko, Mob Boss?
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[START OF COMBO]This combo can be formed with Robaran Mercenaries, Grimgrin, Corpse-Born, Krenko, Mob Boss

Color identity: WUBR
Mana cost: 
Steps:
  1. Activate Robaran Mercenaries using Krenko's ability by tapping it, creating at least two 1/1 Goblin creature tokens.
  2. Activate Robaran Mercenaries using Grimgrin's ability by sacrificing a Goblin, untapping Robaran Mercenaries and putting a +1/+1 counter on it.
  3. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Grimgrin and Robaran Mercenaries
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Robaran Mercenaries does not have summoning sickness.
  - You control at least two Goblins.
[END OF COMBO PREREQUISITES]
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