Sarkoth, Fallen Savant

Deathtouch
When Sarkoth, Fallen Savant comes into play,
exile the D6 top cards from your library. Put any instants and sorceries into your hand and put the
rest into the graveyard.
When casting an Instant or sorcery, you may exile
cards from a graveyard. For each card exiled this
way, reduce the spell's cost by {1}.