River Song + Anurid Scavenger + Walk the Aeons

River Song

Anurid Scavenger

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. Move to your next turn.
3. At the beginning of your upkeep, Anurid Scavenger triggers, causing you to put Walk the Aeons on the bottom of your library from your graveyard.
4. Move to your draw step, drawing Walk the Aeons from the bottom of your library due to River Song.
5. Repeat.

This clever loop exploits River Song's bizarre replacement effect, which forces you to draw cards exclusively from the bottom of your library rather than the top. When you cast Walk the Aeons to take an extra turn, its buyback cost allows you to send it straight to the graveyard instead of exile. From there, Anurid Scavenger's mandatory upkeep trigger forces you to slide that very same Walk the Aeons right back to the bottom of your library, perfectly positioning it for River Song to pull it back into your hand during your draw step.