Call of Yog-Sothoth

Creature cards in graveyards have Gravewalk (This creature can't be blocked except by creature cards in graveyards.)
At the beginning of each combat, treat all creatures
as though they were on the battlefield under their
owner's control until the end of combat. (Enter and
leave the battlefield effects do not activate, if a
creature in a graveyard would be destroyed it is
instead removed from combat)

Creature cards in your graveyard have haste.