Spacesunder

Subtle (Without declaring it, you may silently move
this card from your hand to exile as a Sorcery. If you
do, until your next upkeep, you may cast this card
as an Instant without paying it's mana cost.)

Choose one:
•Tap two target creatures, and place a stun counter on each of them. Lose 2 life.

•Deal X damage to target attacking creature, where
X is the amount of Sorceries and Instants in all graveyards.