Flash (You may cast this spell any time you could cast an instant.)
Vigilance (Attacking doesn't cause this creature to tap.)
When Scuttling Sentinel enters the battlefield, put a +1/+1 counter on another target creature you control. Until end of turn, that creature becomes a blue Crab in addition to its other types and gains
hexproof (This permanent can't be the target of spells or abilities your opponents control.).