I spent ages thinking about her and wasn't that impressed
Unfortunately, to truly maximize Yunas Whistle, you need some serious deckbuilding restraints
Being able to utilize cards in the graveyard is popular with black decks, though its also a quality other colors also have
The large amount of space to Slowking's left is perfect for cards from the Cosmos Holo Era, as they can feature swirls
They served as a sort of tax on players that wanted to play competitively, and balancing the game around their existence made owning them a cost shared by hardcore players everywhere
Like most Pokmon cards, the value of Leafeon depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Majestic Dawn)