Forum:Creature swap vs necrofear

Let say that i have necrofear at my side of the field.then my opponent summons a monster and plays creature swap.then at my turn i destroy by battle the necrofear(the one he took me with his creature swap) then can i activate her effect at my end phase if he has a monster? Also if he destroy my necrofear(when she is equip card) with mysstical space typhoon at my end phase can i use again her effect? And finally if at the end phase my opponent controls no monster her effect then dissapear right?