War of the Spark

Evolution Sage | Creature | Elf Druid | Landfall — Whenever a land enters the battlefield under your control, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) | Simon Dominic

Jiang Yanggu, Wildcrafter | Legendary Planeswalker | Yanggu | Each creature you control with a +1/+1 counter on it has "{T}: Add one mana of any color." −1: Put a +1/+1 counter on target creature. | Anna Steinbauer

Pledge of Unity | Instant | | Put a +1/+1 counter on each creature you control. You gain 1 life for each creature you control. | Chris Rallis

Huatli, the Sun's Heart | Legendary Planeswalker | Huatli | Each creature you control assigns combat damage equal to its toughness rather than its power. −3: You gain life equal to the greatest toughness among creatures you control. | Lius Lasahido

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

Leyline Prowler | Creature | Nightmare Beast | Deathtouch, lifelink {T}: Add one mana of any color. | YW Tang

Rubblebelt Rioters | Creature | Human Berserker | Haste Whenever Rubblebelt Rioters attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control. | Tomasz Jedruszek