when played, it adds 1 to your mana pool and allows you to draw a card (if you have 7 in hand)
That reason is often enchantment-based ramp like Wild Growth and Utopia Sprawl that produce extra mana from one land, letting this produce an absurd 4 mana rather than a respectable 2
Also, the power creep has accelerated a lot and in current meta, you have huge 300+ HP VMAX Pokemon that hit very fast and very hard so often if you miss your setup in the first two turns, you may be out of the game already
Since The Serpent Society will force your opponent to sacrifice a nontoken creature, theres barely any crossover between these cards
This can be three mana to add 10 or more power and toughness
(Thanks to @KingPokemon for the picture of an Uncommon Jungle Sheet and stating there were 7 Butterfrees on a single sheet.) Other Languages Here is also an overview of 1st edition print runs for other languages, excluding the English print runs which we covered above, and the Japanese print runs which well cover in a moment: German (EDITION): Base Set