Mystagen of the Grey

Hexproof.
{u}{r}, {t}: Choose target creature. Mystagen of
the Grey becomes a copy of that creature until
end of turn.
{1}{u}{r}: Exile target creature card from a
graveyard. Mystagen of the Grey becomes a copy
of the exiled card until end of turn. Activate this
ability only any time you could cast a sorcery.