Is this your lens? https://www.amazon.com/Canon-50mm-1-4-Manual-Focus/dp/B005KNZSLS

Assuming it is, then you need an FD-MFT mount adaptor. If you want a speedbooster then this seems to be the only one around: https://www.bhphotovideo.com/c/product/1259765-REG/metabones_mb_spfd_m43_bm3_speed_booster_ultra_0_71x.html

If you don't care about speedboosting, or would rather save 1/5th the cost regardless, then the adaptor only version is only $100: https://www.bhphotovideo.com/c/product/1315239-REG/metabones_mbfd_m43_bt1_canon_fd_to_micro.html