Demiurge, Master Tactician

As long as you have one or fewer cards in hand,
Demiurge, Master Tactician has vigilance and
haste.
Whenever Demiurge, Master Tactician attacks,
you 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.