Svogthir's Hunger (Rav 2.0)

[asi]

Svogthir's Hunger

Enchantment- [subtype]
, Sacrifice a creature: Return target card from your graveyard to your hand.

I like how it turned out to be. I still want some sort of subtype, because there could be neat interactions with those cards. Also, I need to know whether this is too good. I think it could probably create some very good loops containing cards like Deranged Hermit, I just can't see any  at the moment.