The Orzhov Highwing

Invest 5 (When you cast this spell, you may pay 5 life. If you do, when it leaves the battlefield, you gain
5 life.)
Flying, protection from white and from black
The Orzhov Highwing can't be sacrificed.
If you invested in The Orzhov Highwing, when it leaves the battlefield each opponent loses 5 life.