Theros

Annul | Instant | | Counter target artifact or enchantment spell. | Christine Choi

Dissolve | Instant | | Counter target spell. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.) | Wesley Burt

Gainsay | Instant | | Counter target blue spell. | Clint Cearley

Griptide | Instant | | Put target creature on top of its owner's library. | Adam Paquette

Lost in a Labyrinth | Instant | | Target creature gets -3/-0 until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.) | Winona Nelson

Stymied Hopes | Instant | | Counter target spell unless its controller pays {1}. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.) | Peter Mohrbacher

Swan Song | Instant | | Counter target enchantment, instant, or sorcery spell. Its controller creates a 2/2 blue Bird creature token with flying. | Peter Mohrbacher

Triton Tactics | Instant | | Up to two target creatures each get +0/+3 until end of turn. Untap those creatures. At this turn's next end of combat, tap each creature that was blocked by one of those creatures this turn and it doesn't untap during its controller's next untap step. | Jack Wang

Voyage's End | Instant | | Return target creature to its owner's hand. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.) | Chris Rahn

Steam Augury | Instant | | Reveal the top five cards of your library and separate them into two piles. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard. | Dave Kendall