SCP 231-7

When this creature enters the battlefield put an Indestructible counter on it
This creature cant be sacrificed
When another creature you control would die
while this creature has an indestructible counter
on it return it to the battlefield under its owners control and remove an indestructible counter from
this creature. When this creature dies you may
search your library for and card with {b/r} in its
mana cost and put it into your hand.