This is not especially hard to do in any five-color deck, but its even easier if youre also playing Leyline of the Guildpact, which you probably should be doing in a five-color deck anyway (unless its Commander, where it is very banned)
Put another way, this is the cost of a full set in foil: That downward trend is usually present in foil and nonfoil, but Guilds of Ravnica keeps showing us new decks, which causes spikes and the overall value to go up
The Base Set cards, on the other hand, are important because they kicked off the official Pokmon TCG
Key Features Sporting a reimagined design, Pokmon Trading Card Game Classic contains everything Trainers need to play and collect, including: Three Preconstructed Decks: Iconic cards from the history of the Pokmon TCG, including Base Set Venusaur, Charizard and Blastoise, headline three specially constructed 60-card decks featuring Grass, Fire and Water Energy types