Desecration Tome

At the beginning of your upkeep, you may
sacrifice a creature. If you do, mill X cards,
where X is sacrificed creature's power. (Put the
top X cards of your library into your graveyard.)
Threshold — Whenever you discard a card
for the first time each turn, if seven or more
cards are in your graveyard, put the bottom card
of your graveyard into your hand. You lose life
equal to its mana value.