Defaulter's Deeds

Look at the top X cards of your library, where X
is one plus the number of times you have extorted
this turn. Choose one of those cards and put the
rest on the top of your library in random order.
You may reveal the chosen card, and if its mana
value is X or less you may cast it without paying
its mana cost. If you don't cast the chosen card,
put it into your hand.

"With interest..."