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The community-tracked Extremely Rare cards include Martian Lettuce (Space set), Andromeda (Space set), Farmer Feng (China set), Armstrong (Circus set), Barrel Tank (Goblins set), Pig Knight (Warriors set), Archery Camp (Knights set), and Cosmic Carl (Warriors set)

I know that Ultimate Guard and Gamegenic list their portfolios as Designed for double-sleeved cards and Optimized for double-sleeved cards respectively

Except for Cohort

The ranking classes are as follows: Bronze: 0 - 1399 Silver: 1400 - 1749 Gold: 1750 - 2049 Platinum: 2050 - 2299 Diamond: 2300 - 2499 Master: 2500 or higher Beating a Silver or Higher ranked opponent in Ranked awards Duelist Points used to purchase Rarities in game

Mainly used for important monsters early on, with smaller ones just getting descriptions of what's happening