Cast Sensei's Divining Top by paying 0 due to Heliod
When Sensei's Divining Top enters, Fateful Discovery triggers.
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.
Resolve the Fateful Discovery trigger, causing you to draw Sensei's Divining Top from your library.
Repeat
This clever loop transforms your deck into an unstoppable engine by leveraging Heliod, the Radiant Dawn // Heliod, the Warped Eclipse to completely eliminate the casting cost of Sensei's Divining Top, reducing it to a free spell. While Fateful Discovery sits on the board acting as a passive draw trigger every time an artifact enters your control, you can tap Sensei's Divining Top in response to its own entry trigger to cycle it right back onto the top of your library and into your hand. By constantly casting, tapping, and redrawing your artifact for zero mana, you generate an endless stream of card draw and near-infinite storm count.