Undying Flames may require specific deck builds, leaving players open during early game stages
Klinklang PLS/Durant NVI, for instance, utilizes Dowsing Machine perfectly during the mid to late-game phase, borrowing another copy of Enhanced Hammer, Pokmon Catcher, or even Escape Rope/Switch to last that little bit longer until the opponents deck has been properly depleted
In addition to that, it also has an Instant Adventure paying one colorless and one black, plus an additional cost of sacrificing a creature to draw two cards
At six mana, I have to imagine this is another Commander play, and not really a card we'll see much in Standard
If you really want to go down the rabbit hole of abusing Bloodforged Battle-Axe, you can double the tokens with Anointed Procession, tap them for mana with Inspiring Statuary