High Level Magic Scroll

{x}{t}, Sacrifice High Level Magic Scroll: search your library for any target spell and
exile it. Shuffle your library. You may cast
this spell without paying its mana cost. If
the spell is an instant or sorcery spell, roll
1d20. If the result is equal to or less than the
number of lands you control, return that
instant or sorcery spell from your graveyard
to your hand.