Island Fish Jasconius doesn't untap during your untap step.

At the beginning of your upkeep, you may pay . If you do, untap Island Fish Jasconius.

Island Fish Jasconius can't attack unless defending player controls an Island.

When you control no Islands, sacrifice Island Fish Jasconius.

You may choose not to untap Old Man of the Sea during your untap step.

: Gain control of target creature with power less than or equal to Old Man of the Sea's power for as long as Old Man of the Sea remains tapped and that creature's power remains less than or equal to Old Man of the Sea's power.