Can you use manna Abilities on a creature with shroud. Meaning can you activate a abilities with a creature that is given shroud.
If you mean it as:
You have {llanowar elves}
Something gives it shroud
Yes you can still use his mana
If its something like {Devout Invocation}
It doesn't target your creature so you can tap him
If it says "tap three TARGET creatures, then add 3 mana" I believe you cannot do that on the elves with shroud
702.18a (http://imtgapp.com/forum/index.php?action=imtg;area=rule;number=702.18a): Shroud is a static ability. "Shroud" means "This permanent or player can't be the target of spells or abilities."
Yes that's what I mean thank you