Zadraap, Dimir Missionaire

Sneak (this creature can't be blocked as long as
its power and toughness is both equal to its base power and toughness)
When Zadraap, Dimir Missionaire deals
combat damage to a player, put a +1/+1 counter on it.
{2}{u}{b}, {t}, remove a +1/+1counter from
this creature: draw a card.