Shadow Ghost

{e}{e}: This Creature gains Cloak (Gains hexproof
and indestructible unless an opponent controls a
creature with detector)
At the beginning of your main phase you may
pay{e}, if you don't, this creature loses cloak
At the beginning of your turn, if this creature does
not have Cloak, gain{e}
{2}Tap target defending creature. If it has detector,
it loses detector until end of turn.