Lonis, Genetics Expert, Arcbound Ravager, and Delina, Wild Mage

Prerequisites

• Lonis, Genetics Expert on the battlefield
• Arcbound Ravager on the battlefield
• Delina, Wild Mage on the battlefield
• You control at least one Clue token
• Delina does not have summoning sickness

Steps

1. Declare Delina as an attacker
2. Delina triggers, creating at least one token copy of Lonis that isn't legendary
3. Activate Arcbound Ravager by sacrificing a Clue
4. Lonis and the Lonis token's second abilities trigger
5. Resolve the nontoken Lonis trigger, putting a +1/+1 counter on the token Lonis
6. The token Lonis's first ability triggers, creating a Clue artifact token
7. Resolve the token Lonis's trigger from step 2, putting a +1/+1 counter on the nontoken Lonis
8. The nontoken Lonis's first ability triggers, creating a Clue artifact token
9. Resolve the Arcbound Ravager ability
10. Repeat from step 3

Results

• Infinite +1/+1 counters
• Infinite Clue tokens