Sensei's Divining Top + Umori, the Collector + Madame Web, Clairvoyant

Sensei's Divining Top

Umori, the Collector

Madame Web, Clairvoyant

How it works

1. Activate Sensei's Divining Top by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library.
2. Cast Sensei's Divining Top from the top of your library by paying 0.
3. Repeat

This brilliant loop turns your library into a self-sustaining engine by exploiting the interaction between Madame Web, Clairvoyant and Sensei's Divining Top. Because Madame Web lets you cast noncreature spells from the top of your library, you can tap Sensei's Divining Top to draw a card and place itself back on top of your library, and then immediately cast it again from the top. Umori, the Collector makes this entire loop completely free by reducing the cost of artifact spells by {1}, allowing you to repeatedly draw your deck, trigger draw abilities endlessly, and build a near-infinite storm count.