Sensei's Divining Top, Mystic Forge, and Cheering Fanatic

Prerequisites

• Sensei's Divining Top on the battlefield
• Mystic Forge on the battlefield
• Cheering Fanatic on the battlefield
• Cheering Fanatic does not have summoning sickness

Steps

1. Declare Cheering Fanatic as an attacker
2. Cheering Fanatic triggers, choosing "Sensei's Divining Top"
3. Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library from the battlefield
4. Cast Sensei's Divining Top from the top of your library by paying
5. Repeat from step 3

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite storm count