Sarhdan, Rebounding Lich

When you cast Sarhdan, Rebounding Lich put
the top {x} cards of your library in your
graveyard ,where {x} is the amount of total
mana spend to cast Sarhdan, Rebounding Lich.
{g}{b}, Saccrifice Sarhdan, Rebounding Lich:
Return up to 3 different permanents from the
graveyard to the battlefield. (If a card has
multiple permanent types, choose one that
has not been chosen yet.)