I was previously biased against nightfall because in limited, nightfall is more helpful to your opponent than yourself since they get another draw to react to your play. But we've also seen in limited that nightfall can be extremely powerful with multiple
Winter's Grasp and
Lethrai Darkstalker. This deck is an attempt to capture that type of power-level into constructed.
In aggressive decks, Nightfall should be seen as a mechanic that deals 1 damage to your opponent and makes sure you never run out of steam. If played multiple times, Nightfall can end up dealing at least 5 damage making lethal thresholds easier to obtain. Personally, I think this deck is pretty powerful and cheap to boot!