Mnemonic Wall + Cache Raiders + Walk the Aeons

Mnemonic Wall

Cache Raiders

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. At the beginning of your next upkeep on your extra turn, Cache Raiders triggers, returning Mnemonic Wall from the battlefield to your hand.
5. Repeat each turn.