Saheeli Rai + Sun Titan + Karmic Guide + Clever Impersonator

Saheeli Rai

Sun Titan

Karmic Guide

Clever Impersonator

How it works

1. Activate Saheeli Rai's second ability by removing two loyalty counters from it, creating an artifact token copy of Karmic Guide with haste.
2. When the Karmic Guide token enters the battlefield, it triggers, returning Clever Impersonator from your graveyard to the battlefield as a copy of Saheeli Rai.
3. Put the original Saheeli Rai into your graveyard from the battlefield with the legend rule.
4. Activate Clever Impersonator's second ability by removing two loyalty counters from it, creating an artifact token copy of Sun Titan with haste.
5. When the Sun Titan token enters the battlefield, it triggers, returning Saheeli Rai from your graveyard to the battlefield.
6. Put Clever Impersonator into your graveyard from the battlefield with the legend rule.
7. Repeat.

This elegant loop relies on a clever recursion chain between Saheeli Rai, Karmic Guide, and Sun Titan, all tied together by Clever Impersonator. By using Saheeli Rai's loyalty ability to copy Karmic Guide, you can pull Clever Impersonator (disguised as a fresh Saheeli Rai via the legend rule) out of the graveyard to churn out a hasty Sun Titan token. That Sun Titan token then loops back to rescue the original Saheeli Rai from your graveyard, resetting the whole cycle so you can repeat it indefinitely.