Ojer Axonil's a fun buildaround, but it honestly feels a bit overpriced outside of an EDH context? Which sounds ridiculous considering how wild it can get with pump spells or a bunch of pingers, but if your deck is an effective burn deck without it you don't really need it, and if you just want it as a finisher
Torbran, Thane of Red Fell is right there, far broader, and will give an equal-or-bigger pump to anything that deals 2+ damage anyway.
It's kinda like
Pestilent Spirit, where it's win-more if you're mostly running good general-purpose burn spells but becomes more interesting if you're pairing it with stuff like
Iroh's Demonstration and
Searing Blood. And at some point you have ask if that's something you actually want to do vs. something you're doing to support one card that might not even end up in someone's playables.
It's a good pick for a commander cube, or I could see making a custom card that makes it cheaper with lower power if you want to have that janky combo-burn aspect to it (I honestly think it'd be a really cool ability on a 2/1 prowess for


?)