Enslaved Tyrant

Flying
Enslaved Tyrant can't die for as long as an
opponent controls a legendary creature or planeswalker. (This creature has indestructible, can't
be sacrificed and doesn't go to the graveyard for having
0 toughness.)
When Enslaved Tyrant dies, search
your library for a Bolas planeswalker and put that
card into your hand.