Flurry is an ability that triggers when you cast a second spell in a turn, something that Wizards has printed many times in the past
Energy comes in different types corresponding to Pokmon elements (Fire, Water, Grass, Lightning, etc.), and you include these cards in your deck to fuel your Pokmon in battle
At least we know for sure the quantity released for the first six Pikachu cards, which makes them easier to rank on this list
As far as reprint value, it's pretty clearly Invent Superiority that comes out on top
What does surprise me is that Wizards of the Coast printed a three mana, colorless Planeswalker
And Im very sad to report that the TPCi versions havent copied across the absolutely stunning reverse-holo patterning Japan enjoyed, where cards were given a full-card holo effect of glistening bubbles