A lot of storm cards can create creatures such as Elemental Eruption, Empty the Warrens, and Chatterstorm, which can win the game by flooding the battlefield with so many creatures your opponents won't be able to handle them all
Blue decks usually have more cards in their other colors but still have significant blue mana needs since most of the best blue cards require two colored mana (Mana Drain, Braingeyser, Control Magic, Mahamoti Djinn), so mana balance can be a problem
It is one of the easiest and cheapest two for one cards going
In a standard English booster pack, for example, youll get 12 cards, whereas Japanese One Piece card packs have 6
A deck can have up to 4 copies of a card, except for Basic Energy cards