Comprehensive Rules

 

 

123.2a
  In constructed play, a player who chooses to play with stickers must start the game with at least ten sticker sheets selected before play begins, and each of their sticker sheets must be unique. There is no maximum number of sticker sheets a player may start the game with. Each player playing with sticker sheets reveals all of their sticker sheets and chooses three of them at random. See rule 103, “Starting the Game.”