Crude Rampart is a uncommon Creature — Wall card from Onslaught (ONS), collector number 17. Current market price: $0.28 (foil $0.56), TCGplayer market prices via Scryfall.
Defender (This creature can't attack.) Morph {4}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)