As such, if Vivi has the power for it, it's better to use Vivi's effect for mana rather than from lands or mana rocks to cast spells on your turn
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Perhaps you could pair it with something like Toedscruel, whose Slime Mold Colony ability keeps cards stuck in the discard pile
There is another grouping of cards that is important to know
The first of Gengar's moves is super powerful, for only one Psychic energy, Life Drain, allows you to put damage counters on the defending Pokemon until it is 10 hp away from feinting, so if you have a Pokemon that has 200 hp you can do 190 hp in one turn with one Psychic energy card, the only thing that is a downfall to this card is that you have to flip a coin to see if you can use this move at all, if you get heads you can if you get tails you can't, so you have a 50% chance of doing 190 hp damage, I would take that chance any day