Sensei's Divining Top + Umori, the Collector + Skyswimmer Koi

Sensei's Divining Top

Umori, the Collector

Skyswimmer Koi

How it works

1. Cast Sensei's Divining Top by paying 0 due to Umori.
2. When Sensei's Divining Top enters, Skyswimmer Koi triggers.
3. Holding priority, 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.
4. Resolve the Skyswimmer Koi trigger, causing you to draw Sensei's Divining Top from your library, and then discard a card other than Sensei's Divining Top.
5. Repeat

This clever loop turns a modest artifact into an endless engine by leveraging Umori, the Collector's cost reduction to make Sensei's Divining Top completely free to cast. As you repeatedly redeploy the Top, Skyswimmer Koi triggers upon its arrival, letting you cycle through your deck while filtering away unwanted cards through looting. Because Sensei's Divining Top naturally replaces itself on top of your library in response, the Koi's draw trigger snatches it right back out of your library before you ever have to discard it, keeping the cycle spinning indefinitely.