Sultan Daru Al-Rashif

Ordain (When you cast this spell you may tap a
creature you control that shares a color with it. If
you do, this spell becomes ordained.)
When Sultan Daru Al-Rashif enters the
battlefield, if it was ordained, you gain 10 life.
As long as you have the highest life total, white
creatures you control are indestructible and can't
be sacrificed.