Activate Emiel the Blessed by paying 3, blinking Jewel Thief.
When Jewel Thief enters the battlefield, it triggers once, and Preston triggers twice.
Resolve the Jewel Thief trigger, creating a Treasure token.
Resolve the first Preston trigger, creating a token copy of Jewel Thief that is a 0/1 Illusion.
When the Jewel Thief token enters the battlefield, it triggers, creating a Treasure token.
Repeat from step 4 for the remaining Preston trigger.
Activate three Treasures by tapping and sacrificing them, adding 3.
Repeat.
By looping **Emiel the Blessed** to constantly blink **Jewel Thief**, you can repeatedly generate entering-the-battlefield triggers that fuel an ever-growing army of mana-producing cats. **Preston, the Vanisher** turns every uncast reincarnation of the Thief into a 0/1 Illusion copy that contributes its own Treasure token upon arrival, ensuring you have more than enough artifacts to sacrifice for the mana needed to keep Emiel's ability going. Meanwhile, **Delney, Streetwise Lookout** quietly doubles all of those entering-the-battlefield triggers because the creatures involved have a power of 2 or less, letting the engine scale exponentially into an infinite loop of creature tokens and enters-the-battlefield effects.