Worse, because Flashs power is tied to the creatures that are being cheated into play, its power increases over time as creature designs become more powerful
Ignoble Hierarch ($10) Noble has gotten a lot of printings, and rebounded until she got three in a year
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)
The biggest problem they seem to have is managing face cards and new mechanics
So about 75% of Collector Boosters will have a foil rare of some kind in this slot
Anathemancer Ayara, Furnace Queen Bank Job Bituminous Blast Blood for the Blood God