Jump Scare Both the face and alternate commanders in Jump Scare are excellent, with Zimone's landfall trigger giving dread and flipping creatures up for free, and Kianne, Corrupted Memory adding much-needed versatility, giving flash to certain card types based on her power
Both also afford great synergy with all things top of library based such as miracles, Courser of kruphix, Devler of Secrets, Domri Rade etc
Sorcery Kindred - Rogue Sorcery (CTRL to add secondary) Stax Dauthi Voidwalker Shadow (This creature can block or be blocked by only creatures with shadow.) If a card would be put into an opponent's graveyard from anywhere, instead exile it with a void counter on it
Vapor Snag was unique in that blue decks rarely had ways to deal direct damage
If you throw a Helm of Awakening in there, you also get infinite mana