Varre and Mohg

As long as you have one or fewer cards in hand, Varre and Mohg has vigilance and haste.

Whenever Varre and Mohg 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 a random order. Until end of turn, you may cast the exiled card without paying its mana cost.