In Pauper, there are already white-based Squadron Hawk decks that utilize Recommission, and the upgrade from two mana to one mana in that slot is substantial
It won't enter the battlefield, so its enters-the-battlefield ability won't trigger
There will often be cards from that set included in the Masterpiece Series (like how the Battle for Zendikar rare dual lands were included in Zendikar Expeditions), but they will typically exist in the set in a traditional frame in their normal rarity in addition to appearing in the Masterpiece Series
I've had versions of Hellraiser Goblin in many designs, but that particular version never made the cut
Targeted discard lets you deal with practically any card before it hits the battlefield
Rather than building an overly synergistic deck, simply look for 2-for-1s and kill spells, and try to grind out the competition