Sensei's Divining Top + Jhoira's Familiar + Skyswimmer Koi

Sensei's Divining Top

Jhoira's Familiar

Skyswimmer Koi

How it works

1. Cast Sensei's Divining Top by paying 0 due to Jhoira's Familiar.
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 elegant loop transforms a modest artifact into a self-sustaining engine by cleverly manipulating the stack. With Jhoira's Familiar reducing the cost of historic spells to zero, Sensei's Divining Top becomes completely free to cast repeatedly, while Skyswimmer Koi provides the crucial card-filtering trigger whenever that artifact enters the battlefield. By responding to the Koi's trigger by tapping the Top to draw a card and place it back on top of your library, you ensure that the subsequent draw from the Koi puts the Top right back into your hand for no mana investment. This lets you cycle through your deck endlessly, ditching dead cards to the Koi's discard clause while running up an astronomical storm count.