I don't like how this potentially allows you to draw 7 towers in one turn if you had 6 of these creatures out. Having a free extra draw power every turn shouldn't come cheaply.
Questions:
Is the ability active or passive? (lobo-able)
Should this maybe be usable only once per turn? - if it isn't already. As in, not twice if you have 2 of them out.
Maybe simply looking at the next card would be good enough? Instead of drawing? -- I'm not sure about that actually...
I can't think of any other questions atm..
Card can trigger ability multiple times but not if you have a full hand.
Pillars and pends cannot be drawn by the ability.
Permanents are (usually) less common than creatures in a deck, excluding Pillars. The cards that this would be really useful with (Sanctuarry/Dimshield and all their counterparts) would force a duo to work at full efficiency.
(Of the three, I think this is less likely to be nerfed than Grateful Oak.)