Rivals of Ixalan

Admiral's Order | Instant | | Raid — If you attacked this turn, you may pay {U} rather than pay this spell's mana cost. Counter target spell. | Slawomir Maniak

Release to the Wind | Instant | | Exile target nonland permanent. For as long as that card remains exiled, its owner may cast it without paying its mana cost. | Joseph Meehan

Vona's Hunger | Instant | | Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Each opponent sacrifices a creature. If you have the city's blessing, instead each opponent sacrifices half the creatures they control, rounded up. | Zack Stella