Nosk, Faceless Predator

When Nosk, Faceless Predator enters the battlefield, each opponent mills 4 cards.
{1}{b}: Until end of turn, Nosk, Faceless Predator becomes a copy of target creature in an
opponent's graveyard, except it has base power
and toughness 3/4 and is a Shapechanger Spider
in addition to other types.
{u}, {t}: Target opponent mills 4 cards.