The Brothers' War

Horned Stoneseeker | Creature | Lizard | Menace When Horned Stoneseeker enters the battlefield, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") When Horned Stoneseeker leaves the battlefield, sacrifice a Powerstone. | Eric Velhagen

Obliterating Bolt | Sorcery | | Obliterating Bolt deals 4 damage to target creature or planeswalker. If that creature or planeswalker would die this turn, exile it instead. | Campbell White

Sardian Cliffstomper | Creature | Minotaur Barbarian | As long as it's your turn and you control four or more Mountains, Sardian Cliffstomper gets +X/+0, where X is the number of Mountains you control. | Joseph Weston

Third Path Iconoclast | Creature | Human Monk | Whenever you cast a noncreature spell, create a 1/1 colorless Soldier artifact creature token. | Manuel Castañón