A Sign in the Mist

Reveal the top X cards of your library. If {u} was
spent to cast this spell, you may put up to half
(round down) of X non-land cards from among
them into your hand. If {g} was spent to cast this
spell, you may put up to half (round down) of
X land-cards into play tapped. (Do both if {u}{g} was spent.)
"I saw something ghostly in the mist, and I decided to follow it. It was a marble white stag. Regal, yet wary.
And then I saw you, Tristan." — Shareen