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Theyre colorless or have the potential to be colorless when morphed and thus work well with Ugin, the Spirit Dragon and all of the colorless lands the deck rightfully plays
Personally, I would just fill the deck with pieces like Ruin-Lurker Bat or Blind Hunter, just so I could have my Batty fun
It shouldnt be too difficult to enable this over and over again in a dedicated sacrifice deck, so all you need is a Warstorm Surge or Pandemonium and youre off the races
New sets offer new paradigms, and even the weaker cards have a purpose
Those formats that are also played using tabletop MTG cards - like Standard and Limited - will not change