"OP13-042 Edward.Newgate" is a massive [Blocker] with 12000 power
Perhaps unsurprisingly, the currently available leader cards are also the most important characters of the One Piece world, with passive effects that add a bit of extra flavour to each matchup
The best card to buy is the one you can afford without stress
If you are playing Standard, it seems like the minimum amount you will need to spend to remain competitive is about $200 for one of the cheaper aggro decks
16, introduces a new rarity type with a special tactile finish
Most Izzet generals tend to concentrate on either playing spells for reduced cost (Mizzix of the Izmagnus, Jhoira of the Ghitu), or being able to dig through the top of the library to get advantage or access to spells (Keranos, God of Storms, Melek, Izzet Paragon)