Like most Pokmon cards, the value of Drilbur 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 (Black Bolt)
I put the Charizard card in quotes because it is actually a Special Delivery Bidoof card
This promo goes for around $50 on average and has a brilliant piece of full art on the front which features Blastoise, but also includes art of both Gyarados and Vaporeon
Enhanced Stability: Comes equipped with attachable rubber feet, eliminating sliding and safeguarding your surfaces from scratches, for a display that stays pristine
Spiritkeeper is a total house, it is cards like this that greatly reduce the value of chaff like Loyal Cathar
They also have plenty of flavor should you want to slip them into your Commander deck