Lonis, Genetics Expert, Krark-Clan Grunt, and Irenicus's Vile Duplication

Prerequisites

• Lonis, Genetics Expert on the battlefield
• Krark-Clan Grunt on the battlefield
• Irenicus's Vile Duplication in hand
• You control at least one Clue token
• You have enough mana to cast Irenicus's Vile Duplication

Steps

1. Cast Irenicus's Vile Duplication by paying its mana cost, creating a token copy of Lonis that isn't legendary
2. Activate Krark-Clan Grunt by sacrificing a Clue
3. Lonis and the Lonis token's second abilities trigger
4. Resolve the nontoken Lonis trigger, putting a +1/+1 counter on the token Lonis
5. The token Lonis's first ability triggers, creating a Clue artifact token
6. Resolve the token Lonis's trigger from step 2, putting a +1/+1 counter on the nontoken Lonis
7. The nontoken Lonis's first ability triggers, creating a Clue artifact token
8. Resolve the Krark-Clan Grunt ability
9. Repeat from step 2

Results

• Infinite +1/+1 counters
• Infinite Clue tokens
• Infinitely powerful Krark-Clan Grunt until end of turn