Mystic Retrieval + Runic Repetition + Time Walk

Mystic Retrieval

Runic Repetition

Time Walk

How it works

1. Cast Time Walk by paying 1, causing you to take an extra turn after this one.
2. Cast Mystic Retrieval by paying 3, returning Runic Repetition to your hand from your graveyard.
3. Cast Mystic Retrieval from your graveyard for its flashback cost by paying 2, returning Time Walk from your graveyard to your hand and exiling Mystic Retrieval.
4. Cast Runic Repetition by paying 2, returning Mystic Retrieval from exile to your hand.
5. Repeat each turn.