L Lawliet

Flash, You must play L Lawliet and give control
of L to an opponent.
Whenever a creature dies, Investigate, if the
creature died from Light, put an investigation
counter on Light Yagami, Kira.
When L Lawliet has 4 time counters, exile it.
At your end step give control of L Lawliet to
another player besides the caster of L.