Emiel the Blessed | Preston, the Vanisher | Delney, Streetwise Lookout

(and one other card)

Activate
Emiel the Blessed by paying ({3} magic symbol) , 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} magic symbol) .
Repeat.