Sucubus Bat

Flying, first strike
Extort (Whenever you cast a spell, you may
pay {w/b} If you do, each opponent loses 1 life and
you gain that much life.)
Whenever you Extort, you may pay an
additional {b}{b}. If you do, Sucubus Bat
gains deathtouch and you may have
Sucubus Bat block creatures with
unblockable until end of turn.