Rissa the Cryptkeeper

When Rissa enters the battlefield, take the
Keys to the Crypt.
When you complete the Crypt, you may cast
spells from your graveyard with total value x
or less, where x is the times you went through
the Crypt.
{g/w}{u/r}, {ut}, discard a card : Draw two cards.
Devoted to her sacred duty, no one knows if she is
keeping you out.. or something in..