Slipstream Serpent can’t attack unless defending player controls an Island.
When you control no Islands, sacrifice Slipstream Serpent.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
Slipstream Serpent's first ability applies only while you're declaring attackers. If it attacks while face down and then is turned face up, it's still attacking even if the defending player controls no Islands.
19-03-2021
wotc
If a creature attacks a planeswalker, that planeswalker's controller is the defending player.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
(You may cast this card face down as a 2/2 creature for 
. Turn it face up any time for its morph cost.)
Darrell Riche2006-10-06
