My opponent attacks with a 3/3. I block with my 1/1 Llanowar ElvesLlanowar Elves, and have all of my land tapped from my last turn. Can I now tap my Llanowar Elves after it has been declared as a blocker to play Giant Growth on it, make it 4/4 until end of turn, and destroy my opponent's attacking creature when damage is dealt?