Dominaria

Benalish Marshal | Creature | Human Knight | Other creatures you control get +1/+1. | Mark Zug

D'Avenant Trapper | Creature | Human Archer | Whenever you cast a historic spell, tap target creature an opponent controls. (Artifacts, legendaries, and Sagas are historic.) | Winona Nelson

Danitha Capashen, Paragon | Legendary Creature | Human Knight | First strike, vigilance, lifelink Aura and Equipment spells you cast cost {1} less to cast. | Chris Rallis

Pegasus Courser | Creature | Pegasus | Flying Whenever Pegasus Courser attacks, another target attacking creature gains flying until end of turn. | Mathias Kollros

Sergeant-at-Arms | Creature | Human Soldier | Kicker {2}{W} (You may pay an additional {2}{W} as you cast this spell.) When Sergeant-at-Arms enters the battlefield, if it was kicked, create two 1/1 white Soldier creature tokens. | Scott Murphy