Sentinel Sarah Lyons is a rare Legendary Creature — Human Knight card from Fallout (PIP), collector number 118. Current market price: $0.26 (foil $0.65), TCGplayer market prices via Scryfall.
Haste As long as an artifact entered the battlefield under your control this turn, creatures you control get +2/+2. Battalion — Whenever Sentinel Sarah Lyons and at least two other creatures attack, Sentinel Sarah Lyons deals damage equal to the number of artifacts you control to target player.