Sensei's Divining Top + Semblance Anvil + The Lunar Whale

Sensei's Divining Top

Semblance Anvil

The Lunar Whale

How it works

1. 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.
2. Cast Sensei's Divining Top from the top of your library by paying 0.
3. Repeat

This clever loop completely reduces the cost of Sensei's Divining Top to zero, turning its standard ability into a self-sustaining engine. The magic happens because Semblance Anvil reduces the casting cost of artifacts by {2}, entirely eliminating the {1} mana normally needed to recast the Top once you draw it. Meanwhile, The Lunar Whale ensures you can always see and play it directly off the top of your library without ever needing to draw it into your hand, working in tandem with Sensei's Divining Top's own top-decking ability to repeat the cycle indefinitely.