Masters Edition

Seasinger

When you control no Islands, sacrifice Seasinger.
You may choose not to untap Seasinger during your untap step.
{T}: Gain control of target creature whose controller controls an Island as long as you control Seasinger and as long as Seasinger remains tapped.

When you control no Islands, sacrifice this creature.
You may choose not to untap this creature during your untap step.
{T}: Gain control of target creature whose controller controls an Island for as long as you control this creature and this creature remains tapped.

Fifth Edition

If you control no islands, bury Seasinger.
You may choose not to untap Seasinger during your untap phase.
oc
T: Gain control of target creature whose controller controls any islands as long as you control Seasinger and Seasinger remains tapped.

Fallen Empires

Bury Seasinger if you control no islands.
oc
T: Gain control of a target creature if its controller controls at least one island. You lose control of target creature if Seasinger leaves play, if you lose control of Seasinger, or if Seasinger becomes untapped. You may choose not to untap Seasinger as normal during your untap phase.