Yotian Frontliner is a uncommon Artifact Creature — Soldier card from The Brothers' War (BRO), collector number 42. Current market price: $0.25 (foil $0.31), TCGplayer market prices via Scryfall.
Whenever this creature attacks, another target creature you control gets +1/+1 until end of turn. Unearth {W} ({W}: 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.)