Mercyless Bloodseeker

Flash, haste
Pay with Blood 3 (This creature enters the battlefield
with three +1/+1 counters on it. At the beginning of
your upkeep, if there are one or more +1/+1 counters
on this creature, you may remove a +1/+1 counter
from this creature. If you don't, you lose 2 life.)
At the end of your turn, if you didn't remove a
counter from Mercyless Bloodmage this turn, sacrifice it.