The Magic Mirror of Vantress showed Catrina a twisted vision of black oil and bloody machines.

Order of the Mirror

{3}{W/P}: Transform Order of the Mirror. Activate only as a sorcery. ({W/P} can be paid with either {W} or 2 life.)

Soon she understood that it was not the vision that had been twisted, but her own mind.

Order of the Alabaster Host

Whenever Order of the Alabaster Host becomes blocked by a creature, that creature gets -1/-1 until end of turn.

Order of the Mirror // Order of the Alabaster Host

{3}{W/P}: Transform Order of the Mirror. Activate only as a sorcery. ({W/P} can be paid with either {W} or 2 life.) 

 Whenever Order of the Alabaster Host becomes blocked by a creature, that creature gets -1/-1 until end of turn.

Order of the Mirror // Order of the Alabaster Host

Creature — Human Knight // Creature — Phyrexian Knight