Nekros, Soul Manipulator

Flying
Whenever a creature card is put into an
opponent's graveyard from anywhere, you may
pay life equal to its mana value. If you do, put
it onto the battlefield under your control. It's
a Spirit in addition to its other types.
If a Spirit you control would die, exile it instead.
"Nekros possesses the battlefield, Tenno.
Death is his playground." -Lotus