Einstein, Mr Science

When Einstein enters, return all up to 2 instants and sorceries from your graveyard to your hand. Then return all lesson and arcane cards from your graveyard to your hand.

Whenever you cast an instant or sorcery spell from your hand, you may mill X where X is the mana cost of the spell. If you do, that spell gains cascade. If the spell is a lesson or arcane spell, it gains cascade, cascade.