The rarity of this particular card is likely related to how few of them are around, rather than the Pokemon's popularity with fans
Some cards include back-printed options sleeves required for proper use
Too bad it specifies +1/+1 counters are the only ones you can remove with the last ability, even so, paying two power for a 2/2 robot and card draw isn't bad at all
As far as the other new Slivers, there are two Im opting for in my build
This week, that means English Tempest (Booster Box Sealed) Mirage (Booster Box Sealed) Fourth Edition (Booster Box Sealed) Weatherlight (Booster Box Sealed) Visions (Booster Box Sealed) Portal (Booster Box Sealed) Fourth Edition (Starter Deck Sealed) Ice Age (Starter Deck Sealed) German Tempest (Booster Box Sealed) Mirage (Booster Box Sealed) Alliances (Booster Box Sealed) Fifth Edition (Booster Box Sealed) Fourth Edition (Booster Box Sealed) Weatherlight (Booster Box Sealed) Visions (Booster Box Sealed) French Renaissance (Booster Box Sealed)
There is also very little sales data for the Prerelease foil and Surge foil variants of Astrologians Planisphere, but the little that exists suggests that Prerelease foils are worth somewhere between $18-$24, while Surge Foils could be worth $100+