Riku of Two Reflections + Narset's Reversal + Notorious Throng

Riku of Two Reflections

Narset's Reversal

Notorious Throng

How it works

1. Deal combat damage to an opponent using a Rogue.
2. Cast Notorious Throng for its prowl cost by paying 5
3. Riku's first ability triggers - choose not to pay.
4. Holding priority, cast Narset's Reversal by paying , targeting Notorious Throng.
5. Riku's first ability triggers, causing you to pay to copy Narset's Reversal, with the copy targeting the original Narset's Reversal.
6. Resolve the copy of Narset's Reversal, copying the original Narset's Reversal targeting Notorious Throng, and returning the original Narset's Reversal to your hand.
7. Resolve the copy of Narset's Reversal created in step 5, copying Notorious Throng and returning the original Notorious Throng to your hand.
8. Resolve Notorious Throng, causing you to take an extra turn after this one and create a number of 1/1 Faerie Rogue creature tokens.
9. Repeat each turn.

This clever sequence uses Narset's Reversal to perpetually bounce and recast Notorious Throng, leveraging the extra turns and Faerie Rogue tokens to establish an overwhelming lock. Riku of Two Reflections plays a vital role here by capitalizing on the stack: when you respond to your own instant by copying Narset's Reversal, Riku's triggered ability sets off a recursive loop that keeps the spells returning to your hand instead of resolving permanently. Because Notorious Throng's prowl cost was paid, each iteration safely grants you another turn and more attackers to keep the engine running indefinitely.