Michael Myers,Halloween Killer

Michael can't attack or block
Obsession (Stare at your opponents,when you
stared one minute or more on one of your
opponent during the time you are doing nothing
else,Michael gets killer until the end of turn.
Activate this ability only once each turn.)
When Michael becomes the killer, it may attack
and block and it gets +3/+3 and
gain deathtouch and first strike.