Until end of combat, you don't lose this mana as steps end." Mana from firebending abilities isn't lost until you leave combat and go to your second main phase
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Arterial Alchemy: Blood tokens stop being Equipment if Arterial Alchemy leaves the battlefield
That is, make the effect like Abyss Dweller but instead of the anti-Graveyard effect, an effect similar to Deck Lockdown's, if not the same
It's both the best and worst platform simultaneously
However, that was entirely a product of the Strixhaven Limited format being slow enough to accommodate an 8-mana spell, and the set was built around instants and sorceries, so it often just cast 10 spells every time you used it
But, since it's a spider, Arasta is an auto-include in Spider Tribal led by Ishkanah, Grafwidow