This clever loop turns the unassuming Sensei's Divining Top into a bottomless well of cards by exploiting a neat timing interaction on the stack. Cemetery Prowler does the heavy lifting beforehand, quietly shaving the mana cost of artifacts down to zero so you can deploy the Top for free. As soon as that artifact hits the board, Fateful Discovery triggers to hand you a card, but you respond instantly by tapping the Top to draw and tuck it right back onto your library. When the delayed Fateful Discovery trigger finally resolves, it draws the very same Top back into your hand, ready to cast again for zero mana and start the cycle anew.