One With All

One With All's power and toughness are each
equal to the amount of creatures with +1/+1
counters on them.
{t}: Put a +1/+1 counter on target creature for
each planeswalker you control.
{ut}: Remove a +1/+1 counter from target creature
you control.
{t}: Add {u} or {g}.
Infinent energy? Check!