Haunting Sonata

MindDelve {3}, MindDelve {3}(You may discard
3 cards and draw 2 cards to reduce the mana
cost of this spell by {3}.)"
-You gain 1 life for each creature you control
and each creature in your graveyard.
-Return a target Spirit card from your library to
your hand unless you played it using one or
more MindDelves.
-All creatures you control gain Soulshift X, where
X is their converted mana cost minus one, unless
you played it using two MindDelves.