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PSlipstream Serpent
Slipstream Serpent
Creature — SerpentTSPcommon
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
Morph 
(You may cast this card face down as a 2/2 creature for 
. Turn it face up any time for its morph cost.)
6/6
Rulings3
2018-04-27Knight of Grace only gets +1/+0 if any player controls a black permanent, no matter how many black permanents players control.
2018-04-27If an effect says that a creature loses hexproof or can be targeted as though it didn't have hexproof, this applies to hexproof from black as well.
2018-04-27"Hexproof from [quality]" is a variant of the hexproof ability. "Hexproof from black" means "This permanent can't be the target of black spells your opponents control or abilities of black sources your opponents control."