War of the Spark

Awakening of Vitu-Ghazi | Instant | | Put nine +1/+1 counters on target land you control. It becomes a legendary 0/0 Elemental creature with haste named Vitu-Ghazi. It's still a land. | Jaime Jones

Challenger Troll | Creature | Troll | Each creature you control with power 4 or greater can't be blocked by more than one creature. | Svetlin Velinov

God-Eternal Rhonas | Legendary Creature | Zombie God | Deathtouch When God-Eternal Rhonas enters the battlefield, double the power of each other creature you control until end of turn. Those creatures gain vigilance until end of turn. When God-Eternal Rhonas dies or is put into exile from the battlefield, you may put it into its owner's library third from the top. | Lius Lasahido

Nissa, Who Shakes the World | Legendary Planeswalker | Nissa | Whenever you tap a Forest for mana, add an additional {G}. +1: Put three +1/+1 counters on up to one target noncreature land you control. Untap it. It becomes a 0/0 Elemental creature with vigilance and haste that's still a land. −8: You get an emblem with "Lands you control have indestructible." Search your library for any number of Forest cards, put them onto the battlefield tapped, then shuffle. | Chris Rallis

Storm the Citadel | Sorcery | | Until end of turn, creatures you control get +2/+2 and gain "Whenever this creature deals combat damage to a player or planeswalker, destroy target artifact or enchantment defending player controls." | Grzegorz Rutkowski

Thundering Ceratok | Creature | Rhino | Trample When Thundering Ceratok enters the battlefield, other creatures you control gain trample until end of turn. | Izzy

Wardscale Crocodile | Creature | Crocodile | Hexproof (This creature can't be the target of spells or abilities your opponents control.) | Zezhou Chen

Tolsimir, Friend to Wolves | Legendary Creature | Elf Scout | When Tolsimir, Friend to Wolves enters the battlefield, create Voja, Friend to Elves, a legendary 3/3 green and white Wolf creature token. Whenever a Wolf enters the battlefield under your control, you gain 3 life and that creature fights up to one target creature you don't control. | Ryan Pancoast

Bioessence Hydra | Creature | Hydra Mutant | Trample Bioessence Hydra enters the battlefield with a +1/+1 counter on it for each loyalty counter on planeswalkers you control. Whenever one or more loyalty counters are put on planeswalkers you control, put that many +1/+1 counters on Bioessence Hydra. | Mathias Kollros

Roalesk, Apex Hybrid | Legendary Creature | Human Mutant | Flying, trample When Roalesk, Apex Hybrid enters the battlefield, put two +1/+1 counters on another target creature you control. When Roalesk dies, proliferate, then proliferate again. (Choose any number of permanents and/or players, then give each another counter of each kind already there. Then do it again.) | Svetlin Velinov

Niv-Mizzet Reborn | Legendary Creature | Dragon Avatar | Flying When Niv-Mizzet Reborn enters the battlefield, reveal the top ten cards of your library. For each color pair, choose a card that's exactly those colors from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order. | Raymond Swanland