Both Koth's +1 and -2 give you an opportunity to get more mana, though the -2 obviously generates a lot more mana
Cards fitting that definition will make this list
Even though this bright blue scene is getting plenty of appreciation, judging by its solid price, it will always be in the shadow of Misty's Psyduck, and it will likely take a massive shift in the community for this card's value to exceed Psyduck
This cheerful version of the card designed by Ken Sugimori features a PSA 10 population of only 87, making it a staple for any collection
With this being said, if you are more interested in the actual playing of a game, then you wont find a better challenge than Yu-Gi-Oh
Politics may buy you some time, but only against the unprepared