Coral Barrier is a common Creature — Wall card from Magic 2015 (M15), collector number 49. Current market price: $0.07 (foil $0.45), TCGplayer market prices via Scryfall.
Defender (This creature can't attack.) When this creature enters, create a 1/1 blue Squid creature token with islandwalk. (It can't be blocked as long as defending player controls an Island.)