CaptainAmerica
Smash Master
It could without the boss. Personally, I'd prefer something at least recolored though. Metroid's got enough lava-themed stages; I'd like something else. Like the cold metal of Samus/Pika's Subspace levels, or even something like that bridge from Ridley's trailer. Beyond Ridley, I don't think Pyrosphere had that much to offer, but then again I was salty and didn't play that stage much.I don't think that Pyrosphere is coming back due to Ridley becoming playable.
And the Pyrosphere boss could totally go to Alduin on a Skyrim stage...