Calamity Ganon

Deathtouch, Reach, Next phase (When this leaves
the battlefield, put it back transformed)
When this creature enters the battlefield, destroy
all non-artifact creatures
{t} {2}{r}{b}, Put a malice counter on target creature
(A Malice counter gives non artifacts -0/-1, and if you
put it on a opposing artifact creature, you gain control
of it and it gets +1/+1)