Riku of Two Reflections + Narset's Reversal + Nexus of Fate

Riku of Two Reflections

Narset's Reversal

Nexus of Fate

How it works

1. Cast Nexus of Fate by paying 5.
2. Riku's first ability triggers - choose not to pay.
3. Holding priority, cast Narset's Reversal by paying , targeting Nexus of Fate.
4. Riku's first ability triggers, causing you to pay to copy Narset's Reversal, with the copy targeting the original Narset's Reversal.
5. Resolve the copy of Narset's Reversal, copying the original Narset's Reversal targeting Nexus of Fate, and returning the original Narset's Reversal to your hand.
6. Resolve the copy of Narset's Reversal created in step 5, copying Nexus of Fate and returning the original Nexus of Fate to your hand.
7. Resolve Nexus of Fate, causing you to take an extra turn after this one.
8. Repeat each turn.

This brilliant loop turns Riku of Two Reflections into a timeless engine by capitalizing on the clever mechanics of Narset's Reversal. When you cast Nexus of Fate, you can leverage Riku's ability to copy your bounce spell, creating a copy of Narset's Reversal that targets the original while returning it securely to your hand. That same resolution lets you copy Nexus of Fate itself and return the original to your hand, meaning Nexus of Fate's own replacement effect of shuffling into your library is entirely bypassed because it never touches the graveyard. You are left with infinite turns and a hand ready to repeat the entire sequence indefinitely!