How about this new ability:
Eternal (This card cannot be exiled)
So here's a card:
Angelic Knight 1WW
Eternal (This card cannot be exiled)
When Angelic Knight enters play, you gain 1 life
1/2
How about this new ability:
Eternal (This card cannot be exiled)
So here's a card:
Angelic Knight 1WW
Eternal (This card cannot be exiled)
When Angelic Knight enters play, you gain 1 life
1/2
I agree with guy. Also, you're going to need to be clearer - can this be exiled from your library by something like Extract? The rules are clear (it can be), but I can see many people getting it wrong.
Fluttershy is best pony.
"Can't be the target of spells or abilities you opponent controls," would probably be more likely to be used. But, you would still get the same effect.