Coastal Bulwark is a common Artifact Creature — Wall card from The Brothers' War (BRO), collector number 76. Current market price: $0.11 (foil $0.28), TCGplayer market prices via Scryfall.
Defender This creature gets +2/+0 as long as you control an Island. {2}, {T}: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)