When this creature leaves the battlefield, return all cards exiled with it to the battlefield under their owners control
Until end of combat, you don't lose this mana as steps end." (2025-10-02) Mana from firebending abilities isn't lost until you leave combat and go to your second main phase
Use the SV2D card list linked in the article to inspect card numbers, artwork, and rarity before buying sealed or singles
Suspicious Stowaway / Seafaring Werewolf Suspicious Stowaway gets you a cheap looting threat if you can stomach tracking one of Magic's worst mechanics according to MaRo himself: daybound and nightbound
There are probably a number of cool ways to set up board locks with this ability, but one of the most straightforward would be having Gerrard, Adarkar Valkyrie, Oblivion Stone/Nevinyrrals Disk, and Urabrask, the Hidden
The winner, by a cluster of what could be eyes, are the Regis from Astral Radiance