Remmant of the Past

Remmant of the Past costs X less to cast, where
X is the number of spirit cards in your graveyard.
Soulshift 10(When this is put into a graveyard
from the battlefield, you may return target spirit
card with converted mana cost 10 or less from
your graveyard to your hand.), soulshift 9,
soulshift 8, soulshift 7, soulshift 6, soulshift 5,
soulshift 4, soulshift 3, soulshift 2, soulshift 1
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Death always brings life, but not alway