Nao, of Energy

Shroud, Nao, of Energy can't be destroyed.
White creatures get +2/+2, Blue creatures get
+1/+1, Red creatures get -1/-1 and Black
creatures get -2/-2.
Whenever a creature dies because of Nao, of
Energy exile it with a Energy counter instead.
Nao, of Energy has power and toughness equal to
the combined power and toughness of exiled creatures with Energy counters on them plus 4.
{0}: Exile a creature you control and put a
Energy counter on it.