Name:Gust Walker
ManaCost:1 W
Types:Creature Human Wizard
PT:2/2
K:You may exert CARDNAME as it attacks.
T:Mode$ Exerted | ValidCard$ Card.Self | Execute$ TrigPump | TriggerDescription$ When you exert CARDNAME, it gets +1/+1 and gains flying until end of turn.
SVar:TrigPump:DB$ Pump | Defined$ Self | NumAtt$ 1 | NumDef$ 1 | KW$ Flying
Oracle:You may exert Gust Walker as it attacks. When you do, it gets +1/+1 and gains flying until end of turn. (An exerted creature won't untap during your next untap step.)