Contract with the Orzhov

Whenever a black permanent enters the battlefield under your control, each opponent loses 1 life.
Whenever a white permanent enters the battlefield under your control, you gain 1 life.
Whenever a black and white permanent under your control dies, you gain 2 life and each opponent loses 2 life.
{t} Add {w}{b}. Use this mana only to cast black or white permanents.
The contract was signed. Now he was immune to the Orzhov's debt.