Rona, Herald of Invasion #75

Whenever you cast a legendary spell, untap Rona, Herald of Invasion. T: Draw a card, then discard a card. 5(B/P): Transform Rona. Activate only as a sorcery. ((B/P) can be paid with either B or 2 life.)

Trample Whenever a source deals damage to Rona, Tolarian Obliterator, that source's controller exiles a card from their hand at random. If it's a land card, you may put it onto the battlefield under your control. Otherwise, you may cast it without paying its mana cost.