Narset, Enlightened Master + Mirror of Fate + Scrabbling Claws + Temporal Mastery

Narset, Enlightened Master

Mirror of Fate

Scrabbling Claws

Temporal Mastery

How it works

1. Activate Mirror of Fate by tapping and sacrificing it.
2. Holding priority, activate Scrabbling Claws by tapping it, causing you to exile Mirror of Fate from your graveyard.
3. Resolve the Mirror of Fate ability, choosing itself, Temporal Mastery and three to five other cards, then exiling your library and putting the chosen cards on top, ensuring Temporal Mastery and Mirror of Fate are the topmost cards.
4. Declare Narset as an attacker.
5. Narset triggers, exiling the top four cards of your library and allowing you to cast them from exile this turn without paying their mana costs.
6. Move to your postcombat main phase.
7. Cast Temporal Mastery from exile without paying its mana cost, causing you to take an extra turn after this one and exile Temporal Mastery.
8. Cast Mirror of Fate from exile without paying its mana cost.
9. Repeat each turn.