Yugioh- are there cards that are good with discarding for a Cost?

Well it all depends on what type of deck you use. My personal deck has the cyberdark monsters, so if one of my cyberdark monsters is in the graveyard, i activate reincarnation to get it back in exchange for a low level dragon, or i exchange a cyberdark for a black salvo and synchro. another good strategy is to use future fusion and attempt the mythic dragon and send 3 white stones of legend to the grave to gain the BEWDs and either fuse them or send them to the grave and call out montage dragon, and possibly fuse after that too =) just some ideas =)