Fishliver Oil 
Enchantment — Aura
Enchant creature (Target a creature as you cast this. This card enters attached to that creature.) Enchanted creature has islandwalk. (It can't be blocked as long as defending player controls an Island.)
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL