Robaran Mercenaries, Grimgrin, Corpse-Born, and Krenko, Mob Boss

Prerequisites

• Robaran Mercenaries on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• Krenko, Mob Boss on the battlefield
• Robaran Mercenaries does not have summoning sickness
• You control at least two Goblins

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

Results

• Infinite +1/+1 counters on Grimgrin and Robaran Mercenaries
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers