River Song + Epitaph Golem + Temporal Manipulation

River Song

Epitaph Golem

Temporal Manipulation

How it works

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

This clever loop lets you take infinite turns by perpetually recycling a single copy of Temporal Manipulation right back to your hand. The secret engine is River Song, whose unique text turns your library upside down so that you draw cards from the bottom instead of the top. Once Temporal Manipulation is safely in your graveyard after resolving, Epitaph Golem steps in as the bridge, paying two mana to tuck it neatly onto the very bottom of your library where River Song's replacement effect is waiting to scoop it right back into your hand on your next draw step.