Rooftop Assassin

Rooftop Assassin can only be blocked by creatures with flying or reach.
{b}{b}: Rooftop Assassin gains deathtouch until end of turn, it outlashes. You can't target creatures with flying. Activate this ability only once each turn. (To outlash this creature deals damage equal to it's power to any target, that target has to be attacked or it's controller has to have been attacked this turn by a creature you control this turn)