Regril, Collateral Magister

When Regril, Collateral Magister enters the
battlefield, search your library for a card, put
it into your hand, then shuffle your library.
You lose 2 life.
Whenever you search your library for a card
with an odd converted mana cost and
converted mana cost 7 or less, you may pay 3
life. When you do, cast that card without
paying its mana cost.