Reach (This creature can block creatures with flying.)
As long as you've drawn two or more cards this turn, Gnarled Sage gets +0/+2 and has vigilance. (Attacking doesn't cause it to tap.)
Gnarled Sage gets +0/+2 just once, no matter how many cards you've drawn past the second.
If Gnarled Sage gains vigilance after it has attacked, it won't become untapped.
If a spell or ability causes you to put a card into your hand without specifically using the word “draw,” it's not a card drawn.