The idea is to use Hope to get more 3-drops onto the board without needing Sera, while also emptying your hand so you can have a very high likelihood to get a free Proxima even if you don‘t draw Sif.
A typical late game play line is Hope on turn 3, play a proactive 3 on Hope (KM, Sif, Negasonic, MMM) on turn 4 and play 2 3-drops turns 5 and 6, potentially even Surfer+Abs on turn 6 using Hope.
You can also fall back on traditional Brood into Abs, or maybe Gambit into Abs via Hope if you don’t draw Surfer.
You’re probably wondering about Domino. If you don’t draw a lot of discard and are relying on only Gambit on turn 6, having 1 less card in hand because you always play something on turn 2 is very relevant. This deck is less reliant on drawing Surfer so seeing fewer 3’s is an acceptable drawback, but replace it if you don’t like it!