MAGIC MTGA MTG Arena / SECRET LAIR SERIES: LI'L WALKERS (similar as picture).
This is an unused code card from a Secret Lair MTG box.
Each code redemption will reward you with the sleeves listed below (5 exclusive sleeves) in the videogame MTG Arena
1x Tamiyo, the Moon Sage
1x Ajani, Mentor of Heroes
1x Angrath, the Flame-Chained
1x Ashiok, Dream Render
1x Sorin, Grim Nemesis