Simply put, its easy for collectors/lay buyers to accurately price a single card given the sources mentioned earlier (TCGplayer, eBay, PSA, etc.)
Whos the aggressor, who is on the defense
Call your local comic shops and hobby stores to see if theyll buy any of the cards in your collection
There's some expected -1/-1 synergies here, although the priciest card, Chimil, feels very random
The idea that one card can be powerful at almost any point of the game is extremely enticing to me because it reduces the amount of variance and non-games youll play
"Kizan" can summon itself if you have a different "Six Samurai" monster, while "Kageki" summons another "Six Samurai" when Normal Summoned