War of the Spark

Flux Channeler | Creature | Human Wizard | Whenever you cast a noncreature spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) | Heonhwa Choe

Jace's Triumph | Sorcery | | Draw two cards. If you control a Jace planeswalker, draw three cards instead. | Kieran Yanner

Narset, Parter of Veils | Legendary Planeswalker | Narset | Each opponent can't draw more than one card each turn. −2: Look at the top four cards of your library. You may reveal a noncreature, nonland card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. | Magali Villeneuve

Dovin, Hand of Control | Legendary Planeswalker | Dovin | Artifact, instant, and sorcery spells your opponents cast cost {1} more to cast. −1: Until your next turn, prevent all damage that would be dealt to and dealt by target permanent an opponent controls. | Kieran Yanner

Gleaming Overseer | Creature | Zombie Wizard | When Gleaming Overseer enters the battlefield, amass 1. (Put a +1/+1 counter on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.) Zombie tokens you control have hexproof and menace. | Volkan Baǵa

Ashiok, Dream Render | Legendary Planeswalker | Ashiok | Spells and abilities your opponents control can't cause their controller to search their library. −1: Target player mills four cards. Then exile each opponent's graveyard. | Cynthia Sheppard

Invade the City | Sorcery | | Amass X, where X is the number of instant and sorcery cards in your graveyard. (Put X +1/+1 counters on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.) | Sung Choi

Saheeli, Sublime Artificer | Legendary Planeswalker | Saheeli | Whenever you cast a noncreature spell, create a 1/1 colorless Servo artifact creature token. −2: Target artifact you control becomes a copy of another target artifact or creature you control until end of turn, except it's an artifact in addition to its other types. | Wesley Burt

Kiora, Behemoth Beckoner | Legendary Planeswalker | Kiora | Whenever a creature with power 4 or greater enters the battlefield under your control, draw a card. −1: Untap target permanent. | Jaime Jones