Ilvara, Queen of Darkness

Ilvara, Queen of Darkness comes into play with {x} +1/ +1 counters on it. ({x} can be zero)
{t}{g/u}: Add a +1/ +1 counter to Ilvara, Queen of Darkness.
{ut}{b}: Remove a +1/ +1 counter from Ilvara,
Queen of Darkness and place a -1/ -1 counter on
target creature.