: Target creature you control with toughness 2 or less gets +1/+1 and gains flying until end of turn. When Phantasmal Mount leaves the battlefield this turn, sacrifice that creature. When the creature leaves the battlefield this turn, sacrifice Phantasmal Mount.
10/1/2008 If the ability resolves, then the targeted creature’s toughness becomes greater than 2 later, Phantasmal Mount’s effect will not end. (The ability checks whether the creature has toughness 2 or less only at the time you activate it and the time it resolves.)