I could see it being big in a world where key decks are relying on the nonbasic lands like Fountainport, but that is not our current world
In 2021, that was Red-Black madness in Modern Horizons 2
Perhaps theres a niche home for the card in Old School or AB40 (where banding is actually quite good)
Should You Grade Misprint Cards
Let any human settlement grow too large, or advance too far, and suddenly you have Sin knocking at its doorstep, ready to annihilate everyone, spitting out a corrupted husk afterwards
The ETB trigger will almost always enable an attack you didnt have before, and that means that the Pegasus will have an immediate impact on the board, in addition to being a 4-mana 2/3 Flyer itself