Guilds of Ravnica

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

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

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