Guilds of Ravnica

Capture Sphere | Enchantment | Aura | Flash (You may cast this spell any time you could cast an instant.) Enchant creature When Capture Sphere enters the battlefield, tap enchanted creature. Enchanted creature doesn't untap during its controller's untap step. | Mark Behm

Chemister's Insight | Instant | | Draw two cards. Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.) | Josh Hass

Devious Cover-Up | Instant | | Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may shuffle up to four target cards from your graveyard into your library. | Micah Epstein

Murmuring Mystic | Creature | Human Wizard | Whenever you cast an instant or sorcery spell, create a 1/1 blue Bird Illusion creature token with flying. | Mark Winters

Muse Drake | Creature | Drake | Flying When Muse Drake enters the battlefield, draw a card. | Titus Lunter

Wishcoin Crab | Creature | Crab | | James Paick

Artful Takedown | Instant | | Choose one or both — • Tap target creature. • Target creature gets -2/-4 until end of turn. | Mike Bierek

Etrata, the Silencer | Legendary Creature | Vampire Assassin | Etrata, the Silencer can't be blocked. Whenever Etrata deals combat damage to a player, exile target creature that player controls and put a hit counter on that card. That player loses the game if they own three or more exiled cards with hit counters on them. Etrata's owner shuffles Etrata into their library. | Bastien L. Deharme

Nightveil Predator | Creature | Vampire | Flying, deathtouch Hexproof (This creature can't be the target of spells or abilities your opponents control.) | Darek Zabrocki

Connive | Sorcery | | Gain control of target creature with power 2 or less. | Dan Scott

Crackling Drake | Creature | Drake | Flying Crackling Drake's power is equal to the total number of instant and sorcery cards you own in exile and in your graveyard. When Crackling Drake enters the battlefield, draw a card. | Victor Adame Minguez