Lonis, Genetics Expert, Tarrian's Soulcleaver, and Ravenous Intruder

Prerequisites

• Lonis, Genetics Expert on the battlefield
• Tarrian's Soulcleaver on the battlefield
• Ravenous Intruder on the battlefield
• You control at least one Clue
• Tarrian's Soulcleaver attached to Lonis

Steps

1. Activate Ravenous Intruder by sacrificing a Clue
2. Lonis' second ability and Tarrian's Soulcleaver trigger
3. Resolve the Lonis trigger, putting a +1/+1 counter on any other creature you control
4. Resolve the Tarrian's Soulcleaver trigger, putting a +1/+1 counter on Lonis
5. Lonis' first ability triggers, creating a Clue artifact token
6. Resolve the Ravenous Intruder ability from step 1
7. Repeat

Results

• Infinite +1/+1 counters
• Infinitely large Ravenous Intruder until end of turn