Is there anyone who doesnt acknowledge that at this point
Until end of combat, you don't lose this mana as steps end." (10/2/2025) Mana from firebending abilities isn't lost until you leave combat and go to your second main phase
Drawing a card whenever you cast a spell with mana value 5 or greater is excellent with sweepers like pre-rotation Sunfall, where you can kill every creature and draw a card, with removal spells like Leyline Binding, or with the various Overlords that can enter the battlefield for cheap via impeding, like Overlord of the Hauntwoods
While potentially more interesting to build around, his inability to make treasure makes him worse at leading this deck
According to current penalty guidelines, this is a deck/decklist problem, which means you would have to replace the fake with a legal copy of that card (or basic land) and incur a game loss