Unpredictable Propogation

Exile three cards in your graveyard. Target opponent may put those cards into your hand, or let you cast any card of your choice in your graveyard without paying it's mana cost. If they don't choose either, you draw four cards.
"Unknown life will birth from these pods, the first such miracle in centuries. Has our world begun to heal, or does some new, unseen horror lurk within?"
- Archmage Nalia, to Chancellor Namor