Like most Magic: The Gathering cards, the value of Dimir Signet depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Aetherdrift Commander)
However, after playing Pokmon, Trainers, Supporters, and Energy for the turn, you generally have fewer cards in your hand and remain consistent at that number of cards for most of the game
These card holders have a snug fit and are a great choice for thin stock cards
For the pull rates, I have three of the four sources I used for the main sets back in my introductory post on the Sun & Moon Series, namely my own data from Youtube videos (1), that posted on E4 by @burpies (Pull Rates in Sun & Moon - Sword & Shield Sets) (2) and the two videos by Derium (4)
Ignis Scientia [Extended Art Foil] #492 Magic Final Fantasy Keep track of your collection value over time