As to your question, it seems you want to make your creatures all Demons for Rakdos the Defiler's ability. Is that correct? Then it seems that Conspiracy is your best option. However, the main issue is that there is no card that, on its own, would make your lands into Demons which means you will always sac them. You could try some weird Kormus Bell + Urborg, Tomb of Yawgmoth shenanigans to turn them into creatures (and, thus, Demons with Conspiracy) to not have to sac them. Though, it does stop your opponents from having to sac their lands too so keep that in mind.
I am not sure there is a good way to do what you want to.
On a final note, decklists should be posted in the decklist subforum, not here.
As to your question, it seems you want to make your creatures all Demons for Rakdos the Defiler's ability. Is that correct? Then it seems that Conspiracy is your best option. However, the main issue is that there is no card that, on its own, would make your lands into Demons which means you will always sac them. You could try some weird Kormus Bell + Urborg, Tomb of Yawgmoth shenanigans to turn them into creatures (and, thus, Demons with Conspiracy) to not have to sac them. Though, it does stop your opponents from having to sac their lands too so keep that in mind.
I am not sure there is a good way to do what you want to.
On a final note, decklists should be posted in the decklist subforum, not here.