The Brothers' War

Myrel, Shield of Argive | Legendary Creature | Human Soldier | During your turn, your opponents can't cast spells or activate abilities of artifacts, creatures, or enchantments. Whenever Myrel, Shield of Argive attacks, create X 1/1 colorless Soldier artifact creature tokens, where X is the number of Soldiers you control. | Ryan Pancoast

Saheeli, Filigree Master | Legendary Planeswalker | Saheeli | +1: Scry 1. You may tap an untapped artifact you control. If you do, draw a card. −2: Create two 1/1 colorless Thopter artifact creature tokens with flying. They gain haste until end of turn. −4: You get an emblem with "Artifact creatures you control get +1/+1" and "Artifact spells you cast cost {1} less to cast." | Aurore Folny

Mishra, Claimed by Gix | Legendary Creature | Phyrexian Human Artificer | Whenever you attack, each opponent loses X life and you gain X life, where X is the number of attacking creatures. If Mishra, Claimed by Gix and a creature named Phyrexian Dragon Engine are attacking, and you both own and control them, exile them, then meld them into Mishra, Lost to Phyrexia. It enters the battlefield tapped and attacking. | Chris Rahn

Clay Champion | Artifact Creature | Construct | Clay Champion enters the battlefield with three +1/+1 counters on it for each {G}{G} spent to cast it. When Clay Champion enters the battlefield, choose up to two other target creatures you control. For each {W}{W} spent to cast Clay Champion, put a +1/+1 counter on each of them. | Leon Tukker