Necroma Vile

{b}{t}: Target creature you control gains the
zombie subtype in addition to its other types
and gains a -1/-1 counter. In addition,
the creature gains the text "at the
start of combat you may sacrifice
a creature, if you do this creature gains three
+1/+1 counters until the end of turn.
This creature must attack if able" If
target creature already has the zombie
subtype, it will also gain lifelink.