Isochron Scepter + Pull from Eternity + Kess, Dissident Mage + Temporal Mastery

Isochron Scepter

Pull from Eternity

Kess, Dissident Mage

Temporal Mastery

How it works

1. Cast Temporal Mastery by paying 5, causing you to take an extra turn after this one and exile Temporal Mastery.
2. Activate Isochron Scepter by paying 2 and tapping it, casting a copy of Pull from Eternity without paying its mana cost.
3. Resolve Pull from Eternity, putting Temporal Mastery into your graveyard from exile.
4. Move to your next turn.
5. Cast Temporal Mastery from your graveyard by paying 5, causing you to take an extra turn after this one and exile Temporal Mastery.
6. Repeat from step 2.