Saheeli Rai, Sun Titan, Mirrormade, and Encroaching Mycosynth

Prerequisites

• Saheeli Rai on the battlefield
• Sun Titan on the battlefield
• Mirrormade in the graveyard
• Encroaching Mycosynth on the battlefield
• At least three loyalty counters on Saheeli Rai

Steps

1. Activate Saheeli Rai's second ability by removing two loyalty counters from it, creating a token copy of Sun Titan with haste
2. When the Sun Titan token enters the battlefield, return Mirrormade from your graveyard to the battlefield as a copy of Saheeli Rai
3. Put the oldest Saheeli Rai in your graveyard due to the legend rule
4. Activate Mirrormade's second ability by removing two loyalty counters from it, creating a token copy of Sun Titan with haste
5. When the Sun Titan token enters the battlefield, return Saheeli Rai from your graveyard to the battlefield
6. Put the oldest Saheeli Rai in your graveyard due to the legend rule
7. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB