River Song + Transplant Theorist + Temporal Manipulation

River Song

Transplant Theorist

Temporal Manipulation

How it works

1. Cast Temporal Manipulation by paying 3, causing you to take an extra turn after this one.
2. Activate Transplant Theorist 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 gives you infinite turns by endlessly recycling your extra-turn spell right back into your hand. Transplant Theorist provides the mechanical engine you need, letting you spend mana to tuck Temporal Manipulation from your graveyard straight to the bottom of your library. From there, River Song alters the fundamental rules of the game by forcing you to draw cards from the bottom of your library rather than the top, effortlessly feeding Temporal Manipulation right back into your hand during your draw step.