Premium Mystery Borders contain eligible super rare and ultimate border types. Here are the following eligible and ineligible border categories:

Eligible: 

• Super Rare Neon
  • NeonWhite
  • NeonYellow
• Super Rare Cosmic
  • CosmicGold
  • CosmicGreen
  • CosmicOrange
  • CosmicPink
  • CosmicBlue
  • CosmicRed
• Super Rare Metallic
  • Metallic Silver
  • Metallic Gold
• Ultimate Cosmic
  • CosmicBlack
  • CosmicRainbow

Ineligible:

• Rare Neon
  • NeonBlue
  • NeonGreen
  • NeonPurple
  • NeonRed
• Rare Metallic
  • MetallicCopper
• All Holiday-related borders
  • SnowflakesRed
  • SnowflakesBlue
  • WrappingPaper
  • CandyCane
  • IceBlue
• All Web
  • WebBlack
  • WebRed
• All Promo
  • MatteRed
  • MatteBlack
  • DistressedRed
  • DistressedBlue

Odds of pulling each rarity type are as follows: