AlterSleeves.com is the world’s first free marketplace for customised Alter Sleeves for popular TCGs like Magic: the Gathering.
Great Question: Alter Sleeves are high-quality designs printed on perfect-fitting “inner” sleeves that dramatically change the appearance of collectible card game cards without permanently marking them. Players will be able to switch card designs with their mood, temporarily remove designs for specific tournaments or remove an alter when they wish to sell or trade a card.
"This looks like a promising commodity for both alterists and players. As a player this is going to be a super neat way to be able to customize your entire deck for cheap!"
- Hurley Burley Alters