River Song + Soldevi Digger + Walk the Aeons

River Song

Soldevi Digger

Walk the Aeons

How it works

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

By taking advantage of River Song: Meet in Reverse, your library is essentially turned upside down, causing you to draw cards from the bottom instead of the top. This allows you to cast Walk the Aeons for its extra turn, let it go to the graveyard, and then use Soldevi Digger to tuck it right back onto the bottom of your library for a modest investment of two mana. Because River Song: Meet in Reverse rewrites where your draws come from, you immediately draw Walk the Aeons again on your next turn to repeat the entire sequence indefinitely.