Leech Bonder, Cryptolith Rite, and Doubling Season

Prerequisites

• Leech Bonder on the battlefield
• Cryptolith Rite on the battlefield
• Doubling Season on the battlefield
• Leech Bonder does not have summoning sickness
• A creature has a counter on it

Steps

1. Activate Leech Bonder by tapping it, adding
2. Activate Leech Bonder by paying and untapping it, removing a counter from a creature, and putting two of that type of counter on another target creature
3. Repeat

Results

• Infinite proliferate