Bloodsucker Whelp

Flying
When Bloodsucker Whelp enters the battlefield,
each opponent loses 1 life and you gain 1 life. If
you do, create a blood token.
Whenever Bloodsucker Whelp becomes blocked,
it gains +X/+X until end of turn, where X is the
number of creatures that blocked Bloodsucker
Whelp this turn. Those creatures gain -1/-1 until
end of turn.