Melina, Seeker of Purpose

As long as you have one or fewer cards in your hand, Melina, seeker of purpose has vigilance and haste.

Whenever Melina attacks, look at the top six cards
of your library. You may exile a legendary creature card from among them. Put the rest on the bottom of your library in random order. Until the
end of turn, you may cast the exile card without paying it's mana cost.