Knight of the Undead Asylum

When Knight of the Undead Asylum enters the battlefield, choose one -
•Search your library for a card named
Estus Flask, reveal it, put it into your hand,
shuffle your library , Sacrifice Knight of the
Undead Asylum
•Sacrifice a Zombie or Knight creature ;
search your library for a equipment spell, put
it into your hand, shuffle your library
...I must bid you farewell...