This loop is a masterclass in turning a humble artifact into a relentless draw engine, starting with Samut, the Driving Force to radically discount your spells. Once your speed is high enough, Samut, the Driving Force reduces the cost of noncreature spells by {X}, completely paying for the casting cost of Sensei's Divining Top. Meanwhile, Crystal Skull, Isu Spyglass grants you the crucial ability to cast artifacts straight off the top of your library. You simply tap Sensei's Divining Top to draw a card and place it on top of your library, and because Crystal Skull, Isu Spyglass also lets you look at the top card at any time, you always know when your pieces are in place to instantly replay Sensei's Divining Top for free.