Chthonian Nightmare + Shipwreck Dowser + Walk the Aeons

Chthonian Nightmare

Shipwreck Dowser

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. Cast Chthonian Nightmare by paying 1.
4. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
5. Activate Chthonian Nightmare by paying EEEEE, sacrificing a creature with mana value 1 or less, and returning Chthonian Nightmare from the battlefield to your hand, returning Shipwreck Dowser from your graveyard to the battlefield.
6. When Shipwreck Dowser enters the battlefield, it triggers, returning Walk the Aeons from your graveyard to your hand.
7. Cast Chthonian Nightmare by paying 1.
8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
9. Activate Chthonian Nightmare by paying at most E, sacrificing Shipwreck Dowser, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 1 or less from your graveyard to the battlefield.
10. Repeat.

This recursive engine centers around Chthonian Nightmare, which fuels its own activation costs using the energy generated upon entering the battlefield. By cycling Chthonian Nightmare in and out of your hand, you can repeatedly resurrect Shipwreck Dowser to fish Walk the Aeons back out of your graveyard, setting up a loop that ultimately grants you infinite turns.