The Brothers' War

Harbin, Vanguard Aviator | Legendary Creature | Human Soldier | Flying Whenever you attack with five or more Soldiers, creatures you control get +1/+1 and gain flying until end of turn. | Kieran Yanner

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