I made this deck just to get some experience with the two new cards, but it seems to have some legs, even in ranked, and it's interesting to play. This deck makes your opponent's deck not quite do what it's supposed to do.
Winter's Grasp is a clean answer to opponent's
Corrupted Riftborn.
Lipa's Blessing is vital against cards like
Nomnom & Sashenka. Don't sleep on these cards when designing your own decks.
EDIT: Okay, team, I've won 8 games in a row and climbed from rank 80 to rank 25. If you're interested, try the deck like it is, even though it looks like it needs Deliveries and Riftfeeder Wasps. It's doing something right.
EDIT 12/27: With today's new promo card, Boundless Hunger, looking like an attractive and powerful discard spell, I have worked in four
Tight-Lipped, which also guards against
Feed the Hecaton.
Lethrai Darkstalker is probably the least sexy card in the deck.
You could try removing Winter's Grasp and Trail Scourge and run a primal market containing Grasp and Heavy Hail which kind of covers the same bases. Be aware, though, that removing Nightfall cards like Grasp or Stalker is removing a trigger that makes over a third of your deck better in some way.
You might also try replacing Carnosaur because it's in the same power slot as Wasp. (5 + play power to buff = 6) Wasp is better by itself if we've exhausted opponent's removal by then. Carnosaur can affect the board the turn it comes down.
Keep in mind that Deliveries will be countered by opponent's Riftborn, so they're not as reliable as they were two weeks ago.
I hope you have fun with it!