Tertius the Drowned

Spirits you control have soulshift X where X is that creatures converted mana cost (When this creature dies, you may return target Spirit card with converted mana cost X or less from your graveyard to your hand.)
Whenever Tertius the Drowned attacks, put the top four cards of your library into your graveyard, if a Spirit is put into the graveyard this way Tertius the Drowned gains indestructible