The Brothers' War

Great Desert Prospector | Creature | Human Artificer | When Great Desert Prospector enters the battlefield, create a tapped Powerstone token for each other creature you control. (The tokens are artifacts with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") | Nestor Ossandon Leal

Keeper of the Cadence | Creature | Human Wizard | {3}: Put target artifact, instant, or sorcery card from a graveyard on the bottom of its owner's library. | Alix Branwyn

Gaea's Courser | Creature | Centaur Soldier | Whenever Gaea's Courser attacks, if there are three or more creature cards in your graveyard, draw a card. | Michele Giorgi

Hero of the Dunes | Creature | Human Soldier | When Hero of the Dunes enters the battlefield, return target artifact or creature card with mana value 3 or less from your graveyard to the battlefield. Creatures you control with mana value 3 or less get +1/+0. | Taras Susak

Steel Exemplar | Artifact Creature | Wizard | Trample Steel Exemplar enters the battlefield with two +1/+1 counters on it unless two or more colors of mana were spent to cast it. | Kekai Kotaki