Linthana, Rift Regent

Eminence -- Whenever you discard one or more
cards, if Linthana, Rift Regent is in the command
zone or on the battlefield, you may pay 2 life. If
you do, put a card from your graveyard on top of
your library.
Linthana, Rift Regent can't be countered.
{u}{u}{b}, Discard a card: The next spell you cast
has delve. You may activate this ability
only once per turn.