Pensive Professor, Psychic Frog, and Agatha's Soul Cauldron

Prerequisites

• Pensive Professor on the battlefield
• Psychic Frog in exile
• Agatha's Soul Cauldron on the battlefield

Steps

1. Activate Pensive Professor using Psychic Frog's ability by discarding a card, putting a +1/+1 counter on Pensive Professor
2. Pensive Professor triggers, causing you to draw a card
3. Repeat

Results

• Infinite draw triggers
• Infinite rummaging
• Infinite self-discard triggers
• Near-infinite +1/+1 counters on a creature