The Generation 2 Pokemon games brought many changes, including holdable items, myriad new Pokemon to catch and train as well as the addition of two new typings in Steel and Dark
To give perspective, one of the stronger attacker in the game at the time, Hitmonchan, was able to deal 20 or 40 damage max at a cost of three Energy, thus taking several turns to KO Chansey and Charizard
One general ratio to consider is that you need about 2-3 ramp sources per 1 land you remove from the deck
It is often the case that the few artifacts and enchantments in a deck are either really serious threats or of high importance to the decks plan and so even in decks where there are only a couple of targets it is good to be able to deal with them, great example of this include the various equipment, most notably the Swords, Sulphuric Vortex, Zuran Orb, Sneak Attack, Crucible of the Worlds, Oath of Druids and so forth
An investor will refer to a card as being valuable if its performing well price-wise on the market