how can you tell a first edition pokemon card TCG Base Set Checklist: Full Original List What Are First Edition Pokémon

Feels good to the touch

Blackcleave Goblin Contagious Nim Flensermite Flesh-Eater Imp Glistening Oil Hand of the Praetors Ichor Rats Phyresis Phyrexian Crusader Phyrexian Vatmother Plague Stinger Reaper of Sheoldred Scourge Servant Septic Rats Skithiryx, the Blight Dragon Skithiryx, the Blight Dragon Tainted Strike Toxic Nim Whispering Specter

This is a tutorable Overrun for four mana

And, while its not clear how often that document is updated (if ever), a spot check of a few stores listed there shows they are still active and open for business as of late May 2022

Collector boosters contain 15 or 16 cards, not far from other booster packs

Permanents without converted mana cost 3 or less and cast that spell without paying its mana cost