@xouman I didn't consider dropping some Drains. In my first tournament, my list was a bit different. It was with main deck Tinker-Colossus, and the black tutor package instead of red.
My feelings with the present list are goods. But sometimes Drains is not castable in the first or even second turn, so I will probably go down to 3 copy (or may be 2). Also double red Spellbomb isn't needed.
The draw engine was very good, Dack is just awesome to filters, while Jace control opponent draw. But again, I'm far from an Bomberman expert or experienced vintage player, so don't take me on words ;)