While the upcoming Pokmon video games, Pokmon Winds & Waves, are the next generation of the franchise, the Pokmon TCG is still in the previous era, specifically Pokmon Legends: Z-A
Run one or two doublers only in decks built to spend huge mana (X-spells, big creatures, storm-style turns)
Mystic Mine Mystic Mine is definitely the most infamous and aggravating card on this list
Making a creature unblockable for a turn isn't nothing, but having to return the creature to your hand (and probably having to wait at least two turns to try the same thing with the same creature, barring haste) should help mitigate that
One of the most valuable cards from Battle for Baldur's Gate, this costly card is a tutor that lets you pull five different MTG dragon cards from your deck into your hand, giving you any tool you could desire, as long as it's dragon-shaped
We see this deck-building strategy used in what we call "White Weenie" decks