Narset, Enlightened Master + Mirror of Fate + Scrabbling Claws + Alrund's Epiphany

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's first ability by tapping it, exiling Mirror of Fate from your graveyard.
3. 3Resolve the Mirror of Fate ability, choosing itself, Alrund's Epiphany and three to five other face-up cards you own in exile, then exiling your library and putting the chosen cards on top, ensuring Alrund's Epiphany 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. 6During your postcombat main phase, cast Alrund's Epiphany from exile without paying its mana cost, causing you to create two 1/1 Bird creature tokens, take an extra turn after this one and exile Alrund's Epiphany.
7. 7Cast Mirror of Fate from exile without paying its mana cost.
8. 8Repeat each turn.

Effects

• Infinite turns
• Lock