Pandora's Box, Unleashed

Return up to 4 creatures from your graveyard to
the battlefield, they gain Haste, Deathtouch, and
First Strike until end of turn.
If your opponent casts 4 or more non-creature
spells on their turn, transform
Pandora's Box, Unleashed.
"and so...Evil was released into this world all because
of one young girl's foolishness"