This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
Morph {5}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Mana cost
7
U
Mana value
8
Printings
From
$0.04
EDHREC rank
#29118
Buy
Formats
Modern
Legal
Legacy
Legal
Vintage
Legal
Commander
Legal
Pauper
Legal
Rulings
19 Mar 2021
If a creature attacks a planeswalker, that planeswalker's controller is the defending player.
19 Mar 2021
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.