Benthic Biomancer, The Locust God, Cathars' Crusade, and Laboratory Maniac

Prerequisites

• Benthic Biomancer on the battlefield
• The Locust God on the battlefield
• Cathars' Crusade on the battlefield
• Laboratory Maniac on the battlefield
• You have a way to draw a card

Steps

1. Draw a card
2. The Locust God triggers, creating a 1/1 Insect creature token with flying and haste
3. The Insect creature token enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control
4. Benthic Biomancer triggers, causing you to draw a card, and then discard a card
5. Repeat from step 2 until you draw from your empty library, winning the game instead

Results

• Infinite looting
• Near-infinite +1/+1 counters
• Near-infinite creature tokens with haste
• Near-infinite ETB
• Win the game