Mnemonic Wall + Erratic Portal + Walk the Aeons

Mnemonic Wall

Erratic Portal

Walk the Aeons

How it works

1. Cast Walk the Aeons by paying 4, taking an extra turn after this one.
2. Cast Mnemonic Wall by paying 4.
3. Mnemonic Wall enters the battlefield, returning Walk the Aeons from your graveyard to your hand.
4. Activate Erratic Portal by paying 1 and tapping it, returning Mnemonic Wall from the battlefield to your hand.
5. Repeat each turn.

This brilliant loop locks down the game by chaining infinite extra turns through Walk the Aeons. Every time you cast the spell, you can bring it right back to your hand thanks to Mnemonic Wall, whose enter-the-battlefield trigger continuously rescues your key instant or sorcery from the graveyard. To keep the engine running, Erratic Portal provides the crucial mechanical bridge, letting you bounce the Wall back to your hand for just one mana so you can replay it on your next turn.