Bobosk, Resurgent Wrath

Whenever this creature attacks roll a D 20.
Whenever you roll a d20 do the indicated effect.
D1-15 I Return target creature from your
graveyard to your hand.
D 16-18 I Return target creature from your
graveyard to the battlefield.
D 19-20 I Return target creature from your
graveyard to the battlefield, give it undying
If this creature is in your graveyard and you roll
a natural 20 on a D20 return this creature
to the battlefield.