Marus, Mind Aflame

Prowess, Ward {x} - X is equal to the difference in
life from your starting life total .
Whenever you search your library you may pay
10 life. If you do, you may play a card with mana
value less than Marus, Mind Aflame's power from
your library. (you still have to pay the spell's cost)
He'll pay any price to find his answers.