Seasinger 
Creature — Merfolk
When you control no Islands, sacrifice this creature.
You may choose not to untap this creature during your untap step.
: Gain control of target creature whose controller controls an Island for as long as you control this creature and this creature remains tapped.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL