The Brothers' War

Thopter Mechanic | Creature | Human Artificer | Whenever you draw your second card each turn, put a +1/+1 counter on Thopter Mechanic. When Thopter Mechanic dies, create a 1/1 colorless Thopter artifact creature token with flying. | Joshua Raphael

Zephyr Sentinel | Creature | Human Soldier | Flash Flying When Zephyr Sentinel enters the battlefield, return up to one other target creature you control to its owner's hand. If it was a Soldier, put a +1/+1 counter on Zephyr Sentinel. | Inkognit

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

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

Sarinth Steelseeker | Creature | Human Artificer Scout | Whenever an artifact enters the battlefield under your control, look at the top card of your library. If it's a land card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard. | Olivier Bernard

Yotian Dissident | Creature | Human Artificer | Whenever an artifact enters the battlefield under your control, put a +1/+1 counter on target creature you control. | Steve Prescott

Evangel of Synthesis | Creature | Phyrexian Human Cleric | When Evangel of Synthesis enters the battlefield, draw a card, then discard a card. As long as you've drawn two or more cards this turn, Evangel of Synthesis gets +1/+0 and has menace. | Denman Rooke

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

Ashnod's Harvester | Artifact Creature | Construct | Whenever Ashnod's Harvester attacks, exile target card from a graveyard. Unearth {1}{B} ({1}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.) | Halil Ural