Fortified Beachhead is a rare Land card from The Brothers' War Promos (PBRO), collector number 262p. Current market price: $0.37 (foil $0.72), TCGplayer market prices via Scryfall.
As this land enters, you may reveal a Soldier card from your hand. This land enters tapped unless you revealed a Soldier card this way or you control a Soldier. {T}: Add {W} or {U}. {5}, {T}: Soldiers you control get +1/+1 until end of turn.