Ikkira, Entropic Oni

Wither(This creature deals damage to other creatures
in the form of -1/-1 counters)
When Ikkira enters the battlefield, put a -1/-1
counter on target creature.
Ikkira's base power and toughness are equal to
the highest power and toughness of a creature
with a -1/-1 counter on it, or 1/1 whichever
is higher.