Upon purchase, you'll receive TWITCH account.
Link it to your game account to claim the following items: 

1. Costumes(9): Magneto, Hela, Adam Warlock, Namor, Emma Frost, Magik, Hawkeye, Mantis, Star-Lord
2. Nameplates(12): Magneto, Hela, Adam Warlock, Namor, Emma Frost, Magik, Hawkeye, Mantis, Star-Lord, Dancing Fortune, Bright Gaze, Ignite GZ
3. Sprays(13): WoG 1, WoG 2, WoG 3, WoG 4, WoG 5, WoG 6, WoG 7, WoG 8, Two-in-One, Winter Stockings, Chronovium, Mid-Season Ignition, Ignite GZ
4. Emotes(8): Magneto, Hela, Namor, Emma Frost, Magik, Hawkeye, Mantis, Star-Lord

NOTE: 
!!! Claim items promptly post-purchase; they may expire.
!!! Unlink the Twitch account once all items are collected.
!!! Items hidden after 6 months are still claimable.

These items can only be obtained once per account. You will only receive items that you have not received before. To receive items, you must unlink the old twitch from your game account.