Core Set 2021

Cancel | Instant | | Counter target spell. | Mathias Kollros

Discontinuity | Instant | | As long as it's your turn, this spell costs {2}{U}{U} less to cast. End the turn. (Exile all spells and abilities from the stack, including this card. The player whose turn it is discards down to their maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.) | Volkan Baǵa

Frantic Inventory | Instant | | Draw a card, then draw cards equal to the number of cards named Frantic Inventory in your graveyard. | Aaron Miller

Frost Breath | Instant | | Tap up to two target creatures. Those creatures don't untap during their controller's next untap step. | Mike Bierek

Lofty Denial | Instant | | Counter target spell unless its controller pays {1}. If you control a creature with flying, counter that spell unless its controller pays {4} instead. | Manuel Castañón

Miscast | Instant | | Counter target instant or sorcery spell unless its controller pays {3}. | Steve Argyle

Opt | Instant | | Scry 1. Draw a card. | Tyler Jacobson

Rain of Revelation | Instant | | Draw three cards, then discard a card. | Nils Hamm

Rewind | Instant | | Counter target spell. Untap up to four lands. | Dermot Power

Rookie Mistake | Instant | | Until end of turn, target creature gets +0/+2 and another target creature gets -2/-0. | Zoltan Boros

Sublime Epiphany | Instant | | Choose one or more — • Counter target spell. • Counter target activated or triggered ability. • Return target nonland permanent to its owner's hand. • Create a token that's a copy of target creature you control. • Target player draws a card. | Lindsey Look

Unsubstantiate | Instant | | Return target spell or creature to its owner's hand. | Victor Adame Minguez