You may exert Gust Walker as it attacks. When you do, it gets +1/+1 and gains flying until end of turn. (An exeted creature won't untap during your next untap step.)
"I'm never unarmed."
Illus. Jason Rainville
2/2
MYTHICSPOILER.COM THE CYCLICAL MTG SPOILER
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KHANS OF TARKIR 
COMMANDER 2014
FTV: ANNIHILATION 
SPEED vs CUNNING 
MAGIC 2015 
CONSPIRACY 
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