There are many cards that allow you to put cards on the bottom of your deck, either as part of an effect (Secret Clocktower) or as a drawback (Pipippi, Electro-Riser).
Chester Romanoff, the Wicked God and other spells casting Knights such as Romanoff the 1st, Lord of the Demonic Eye and Greatest Caesar, the Dark Kaiser returns the spell they casts with their on attack effects or Meteorburn to the bottom of your deck.