These two are a bit less powerful than their white, blue, and black counterparts, but they'll absolutely see play with Ashling and the backup commander, Mass of MysteriesMass of Mysteries, as well as the aforementioned Horde of Notions
Thoughtseize It may cost you two life on top of the one mana, but Thoughtseize is one of the most effective reveal/discard combos available
(Until your next turn, those creatures attack each combat if able and attack a player other than you if able.) Overload (You may cast this spell for its overload cost
Sorcery Choose three
Blue can be oppressive to fight through for Red, Boros, or Gruul decks
Otherwise, its still a great way to use that extra two mana for about a 25% chance of success