Hey Fiery,
sorry was a few days without Internet. From what i've seen the connection will be through an Daughterboard connected by USB. Adafruit suggested this Adafruit Feather M0 Express - ATSAMD21 Cortex M0
Alternatives would be Adafruit Feather M4 Express - Featuring ATSAMD51 - ATSAMD51 Cortex M4 or Adafruit ItsyBitsy M4 Express featuring ATSAMD51