Alara

Sacrifice a mountain: You may cast target
creature card in your graveyard for its mana
cost until end of turn. It gains haste. Shuffle
it into your library it at the beginning of the
next end step or if it would leave the battlefield.
Activate only as a sorcery.
Whenever you search your library for a land
card, you may search your sideboard instead.
(Sideboards can have any number of any
basic land.)