Season 3 is where the show went from "huge hit" to "cultural phenomenon." From Dany freeing the Unsullied at Astapor to the devastating (The Rains of Castamere), you need a format that does justice to the cinematography.
Disclaimer: Always support the creators. The night is dark and full of terrors, but piracy is not the way. Consider buying the 4K Blu-ray box set and ripping it to MKV for your Plex server. If you are building a media server (Plex, Jellyfin, or Emby), Game of Thrones Season 03 MKV is non-negotiable. You want the episode "And Now His Watch Is Ended" (the one with the badass Astapor rebellion) to look flawless. game of thrones season 03 mkv
Suggested internal links: Guide to playing MKV files on your Smart TV | Best subtitle settings for GoT Season 3 is where the show went from