The Lost Caverns of Ixalan

Brackish Blunder | Instant | | Return target creature to its owner's hand. If it was tapped, create a Map token. (It's an artifact with "{1}, {T}, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.") | Daarken

Confounding Riddle | Instant | | Choose one — • Look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard. • Counter target spell unless its controller pays {4}. | A. M. Sartor

Hurl into History | Instant | | Counter target artifact or creature spell. Discover X, where X is that spell's mana value. (Exile cards from the top of your library until you exile a nonland card with that mana value or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.) | Eli Minaya

Out of Air | Instant | | This spell costs {2} less to cast if it targets a creature spell. Counter target spell. | Francisco Miyara

Relic's Roar | Instant | | Until end of turn, target artifact or creature becomes a Dinosaur artifact creature with base power and toughness 4/3 in addition to its other types. | Nino Vecia

Unlucky Drop | Instant | | Target artifact or creature's owner puts it on the top or bottom of their library. | Patrik Hell