Philosopher's Stone

Sacrifice Philosopher's Stone: Search your library
for a card and put it into your hand.
Then shuffle your library
Exile Philosopher's Stone:
You lose 20 life and draw 10 cards.
The Philosopher's Stone is the key to all mysteries,
but also the lock that seals them. He who seeks it must
be ready to pay the ultimate price, for the stone will
not yield its secrets easily.