GT's are special because they have the slots of different archetypes (which is up to the player who created the card). So cards will have abilities they normally wouldn't be able to get (like Lamar Jackson getting hot route master). The x2 means that two of the slots are of that specific archetype. Let me provide an example: RG3 GT gets x2 improvisor, 1x field general, and 1x strong arm - therefore he can get the best abilities from each of those archetypes, with improvisor having two slots. Hope that helped!
GT's are special because they have the slots of different archetypes (which is up to the player who created the card). So cards will have abilities they normally wouldn't be able to get (like Lamar Jackson getting hot route master). The x2 means that two of the slots are of that specific archetype. Let me provide an example: RG3 GT gets x2 improvisor, 1x field general, and 1x strong arm - therefore he can get the best abilities from each of those archetypes, with improvisor having two slots. Hope that helped!