Alia, Herald of Muad'dib

Whenever you cast a legendary spell, untap
Alia, Herald of Muad'dib.
{t}: Draw a card, then discard a card.
{5}{p/b}: Transform Alia. Activate only as a
sorcery. ({p/b} can be paid with either {b} or
2 life.)

Rona, Herald of Invasion