This is exactly what happened to the Fairy-type, as its popularity in the video games did not translate well to the TCG
Restless Cottage Land Restless Cottage enters the battlefield tapped
I don't mean cards that could make us a token in edge cases (we all know who ends up getting the Elephant from Generous GiftGenerous Gift 98% of the time)
You also seem to have a weird sacrifice subtheme with Ravenous Amulet, Vampire Gourmand, Dreg Recycler, Ayara, First of Locthwain, Vein Ripper, and Liliana, Dreadhorde General

Dratini #26Uncommon $3.48 Dratini #150Common $0.19 Dratini #26Uncommon $13.10 Dratini #38Uncommon $1.27 Dratini #124 $0.16 Dratini #53Common $1.50 Dratini #63Common $15.58 Dratini #107Common $9.98 Dratini #26Uncommon $10.51 Dratini #91Common $6.85 Dark Vaporeon #9Holo Rare $134.96 Growlithe #45Uncommon $6.12 Machamp #15Holo Rare $49.99 Zapdos #19Holo Rare $41.75 Dark Persian #6Holo Rare $36.48 Arcanine #36Uncommon $7.02 Nidorina #55Uncommon $1.46 Moltres #30Rare $13.55 Dark Dragonite #5Holo Rare $240.97 Golem #24Rare $5.23 Pokemon 2-Player Starter Set (Revised Base Set Reprint Run) $239.40 Base Set Theme Deck - "Blackout" (Revised Base Set Reprint Run) Base Set Theme Deck - "Zap!" (Revised Base Set Reprint Run) $499.95 Base Set Theme Deck - "Brushfire" (Revised Base Set Reprint Run) Base Set Theme Deck - "Overgrowth" (Revised Base Set Reprint Run) $685.00 Base Set Booster Pack [Revised Unlimited Edition] $786.87 Base Set Booster Box [Revised Unlimited Edition] $499.99 Pokemon Base Set (Shadowless) [1st Edition] Booster Box

If youre buying singles at a card show , watch out for the priced to grade markup