There are few things in Magic I like more than free spells and blue tempo decks, and today's list checks off both boxes.
Thing in the Ice has been seeing more play in Modern as of late since it can easily undo a lot of the work that the popular creature decks do in the early turns. Humans, Hollow One, Affinity, and even a deck like Mardu Pyromancer don't like to see their creatures bounced in one fell swoop while the 7/8 Awoken Horror makes recovering quickly a dicey proposition. Also, Thing's four points of toughness make it difficult to answer given the ubiquity of Lightning Bolt in the current metagame, though Fatal Push and Reflector Mage are still problematic.
We've seen the hibernating horror become a key sideboard card for Blue Moon decks, with some variants moving them to the maindeck and making it a primary focus of the deck, but today's list eschews the red nonsense for a
Disrupting Shoal is a card I'm always looking to play in Modern because protecting an early advantage can be game-ending. In this case, protecting your Thing in the Ice on turn two is very important and you don't much care about the card disadvantage so long as you're very far ahead on tempo. Spell Pierce acts similarly as protection that's also good against turn one discard spells and even the deck's primary removal spell, Vapor Snag, can let you reset a critical Thing or save a Snapcaster Mage to be reused later.
Honestly, this deck has to be immensely frustrating to play against as an aggro deck. There's so much bounce that your hand is always full and one of the great joys of playing aggressive decks is not having to hold your hands up like a sucker. Just throw it on the table, kick back, and relax with both hands free to play the bongos, yo-yo, or smoke a fancy pipe. Whatever you want, it's dealer's choice. But no, all your creatures keep going back to your hand. It's exhausting.
But playing decks that tilt my opponents (especially if their name rhymes with Chad Smellson) is another of Magic's great joys. And that's why Shadow of Doubt is my favorite card in the deck. Stifle on a fetchland is among Magic's most tilting plays, but when you add the insult of a cantrip to that injury, it takes it to a whole new level. And don't even get me started on tagging a Chord of Calling or Gifts Ungiven.
What a great deck.