Suguru Geto, Nauseating

Cursed Spirits you control get +X/+X where X
is the number of cursed spirits you control on
the battlefield.
Cursed Spirit Manipulation Technique — You may
gain control of or cast Cursed Spirit cards from a graveyard or exile by paying life equal to its
power. Creatures you gain control of this way
have: "If this creature would go back to its
owner's hand, it instead goes back to your hand."