Manta Ray 
Creature — Fish
This creature can't attack unless defending player controls an Island. This creature can't be blocked except by blue creatures. When you control no Islands, sacrifice this creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL