Willis Flournoy was a decent enough pitcher IRL in his NeL career spanning 14 seasons, with SH crediting him with 12.2 total pWAR and EC allotting him 24.2 in his MLEs.
That said, not in my wildest expectations was this magnificent milestone even remotely feasible, nor his near-100 pWAR / 88 FIP- / 115 ERA+.
He's 38 now and, with two years after this one left on his current contract with the Yanks, looks like he could well follow John Donaldson's lead and pitch well into his 40s, which would see him move even further up this list - perhaps even into the top 3. Either way, he's a HoF lock.