if a planeswalker is exiled then returned to the battlefield can you activate its abilities
if a planeswalker is exiled then returned to the battlefield can you activate its abilities
Of course. Planeswalkers abilities can be activated the turn they enter the battlefield.
As long as it's your turn (in other words, as long as you normally could).
Fluttershy is best pony.
Doesn't it have summoning sickness since you didn't control it from beginning of turn?
Creatures are the only things affected by summoning sickness. Also loyalty abilities do not require tapping.
What if u already used its ability earlier that turn than
That wouldn't matter. When something enters the battlefield it's a new object.