Almalexia, Lady of Mercy

Whenever a creature you control dies, you
may pay {1} and sacrifice another creature.
If you do, return that creature to the
battlefield under your control with a +1/+1
counter on it. At the beginning of your
upkeep, if there are ten or more +1/+1
counters on creatures you control,
transform Almalexia into Almalexia,
Lady of Betrayal.