I'll analyze the winrate data for Belcher in Modern.
I don't have sufficient tournament data to provide meaningful winrate statistics for Belcher in Modern. The database contains only a single tournament entry from February 2025, which recorded 0 wins and 1 loss at an SCG Last Chance Qualifier in Portland.
Belcher appears to be an extremely rare archetype in the competitive Modern metagame with essentially no recorded tournament presence over the past year. Without a meaningful sample size of matches, I cannot calculate reliable winrate data for this deck.
Sources
Data from 1 tournament (100% Melee). The single recorded Belcher entry: