River Song + Soldevi Digger + Capture of Jingzhou

River Song

Soldevi Digger

Capture of Jingzhou

How it works

1. Cast Capture of Jingzhou by paying 3, causing you to take an extra turn after this one.
2. Activate Soldevi Digger by paying 2, causing you to put Capture of Jingzhou on the bottom of your library from your graveyard.
3. Move to your next turn, drawing Capture of Jingzhou from the bottom of your library due to River Song during your draw step.
4. Repeat.

This clever loop turns the library upside down by leveraging River Song, whose unique text makes you draw cards from the bottom of your library instead of the top. Once you cast Capture of Jingzhou to earn an extra turn, it naturally hits your graveyard, ready for Soldevi Digger to tuck it right back onto the bottom of your library for a modest investment of two mana. Because of River Song's replacement effect, your very next draw step hands that exact extra turn spell right back to your hand, establishing an unyielding engine for infinite turns.