Island Fish Jasconius is a rare Creature — Fish card from Arabian Nights (ARN), collector number 16. Current market price: $50.75, TCGplayer market prices via Scryfall.
This creature doesn't untap during your untap step. At the beginning of your upkeep, you may pay {U}{U}{U}. If you do, untap this creature. This creature can't attack unless defending player controls an Island. When you control no Islands, sacrifice this creature.