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Target creature gets +2/+2 and gains flying until end of turn. You gain 2 life.
A creature gaining flying after it has been blocked by a creature without flying or reach won't remove the blocking creature from combat or cause the creature it blocked to become unblocked.
If the target creature is an illegal target by the time Desperate Lunge tries to resolve, the spell doesn't resolve. You don't gain 2 life.
