This might go hard in spellslinger decks. If you have anything that creates a token when you cast the prepared spell, this creature becomes prepared again, and you can keep casting the prepared spell as long as you have the mana.

It goes infinite with [[Storm-Kiln Artist]] and many things ( [[Pearl Medallion]], [[Veyran, Voice of Duality]], [[Kykar, wind’s fury]], [[Xorn]], [[Birgi, God of Storytelling]], [[Swarm Intelligence]], a second copy of Storm-Kiln Artist, …)

It also goes infinite with just [[Goldspan Dragon]], cast the prepared spell targeting the dragon, you get a treasure that taps for two and the spell is prepared again