Slipstream Serpent (TSP) from Time Spiral, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Darrell Riche
• Card Text:
  Slipstream Serpent can't attack unless defending player controls an Island.
  When you control no Islands, sacrifice Slipstream Serpent.
  Morph 5U (You may play this face down as a 2/2 creature for 3. Turn it face up any time for its morph cost.)