No. The creatures would still be able to tap for mana b/c mana abilities are distinct from activated abilities.
September 25, 2014 2:48 a.m.
@bill Incorrect. The "T: Add X to your mana pool" ability is an activated ability. It is also a mana ability, but that doesn't mean it isn't an activated ability. Linvala will stop it.
September 25, 2014 2:51 a.m.
Sorry, I was wrong. Ruling on Linvala:
6/15/2010 No abilities of creatures your opponents control can be activated, including mana abilities.
Carry on. :)
September 25, 2014 2:52 a.m.
Oh, I guess I could've checked the ruling first. XD Sorry, and thanks