This might be common knowledge, but I only just discovered it yesterday and couldn't find it posted here
Basically linking your EA account to your twitch or prime account yields you 7 loot prizes - one a month, monthly for 7 months.
Unfortunately I only discovered it yesterday - I claimed prize #5, which is available until 20th july.
The prime pack includes:
• 1x Player Pick of four 83 OVR or better players
• 5x gold rare players