Giving another critter two more power and trample whenever they attack together is not bad, but what really puts Oliphaunt over the top is its Mountaincycling cost
Thanks for joining us on this tour
I could probably split each of these tiers into two or three more if I wanted to
There are several reasons for this, including the fact that they were the first to be released and therefore more difficult to find and collect, as well as the fact that they were more popular in their day than many of today's most valuable Pokemon cards (which have only come into existence within the past several years)
Any sane player would try to get rid of the traps first before trying to send more cards to the graveyard, but the AI will happily kill itself in such scenario
Like most Pokmon cards, the value of Jolteon 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 (Skyridge)