FRA-70 Void Extrapolator

This creature enters prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)
Threshold - This creature gets +1/+1 as long as there are seven or more cards in your graveyard.
//Prep//
Omit Variables

Sorcery
Mill three cards. (Put the top three cards of your library into your graveyard.)