Pensive Professor, and Iron Man, Armored Avenger

Prerequisites

• Pensive Professor on the battlefield
• Iron Man, Armored Avenger on the battlefield

Steps

1. Draw a card
2. Iron Man triggers, putting a +1/+1 counter on Pensive Professor
3. Pensive Professor triggers, causing you to draw a card
4. Repeat from step 2

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite +1/+1 counters on a creature