The Deck of Dragons

{2},{t}: Up to two target creatures gain vigilance,
flying, menace, haste or trample until end of
turn. Activate only once each turn and only as a
sorcery.
{x}{x},{t}: Look at the top X cards of your library.
You may reveal any number of legendary
creature cards from among them and put them
in your hand. Put the rest on the bottom of your
library in a random order. Sacrifice this artifact.