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

Prerequisites

• Narset does not have summoning sickness.
• An opponent is unable to block and kill Narset.
• You have at least three other cards in exile.

Steps

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

Effects

• Infinite turns
• Lock