In the Trenches is a mythic Enchantment card from The Brothers' War Promos (PBRO), collector number 8s. Current market price: — (foil $1.89), TCGplayer market prices via Scryfall.
Creatures you control get +1/+1. {5}{W}: Exile target nonland permanent you don't control until this enchantment leaves the battlefield. Activate only as a sorcery and only once.