Sensei's Divining Top + Cemetery Prowler + Rook Turret

Sensei's Divining Top

Cemetery Prowler

Rook Turret

How it works

1. Cast Sensei's Divining Top by paying 0 due to Cemetery Prowler.
2. When Sensei's Divining Top enters, Rook Turret 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 Rook Turret 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 the classic self-replacing artifact into a cost-reducing engine, fueled by Cemetery Prowler making artifacts effectively free to cast. As you cast and recast Sensei's Divining Top, its entry triggers Rook Turret to filter your hand with its loot effect. By responding to that trigger by tapping the Top to draw itself and tuck it back onto your library, Rook Turret's resolution plucks it right back out into your hand to repeat the cycle indefinitely.