Custom Cards - Manticore uses customs to provide greater flexibility and cross-pollination between archetypes.
Abundant Cards - Marked by a skull, abundant cards are 'pick 1, get 2 copies', allowing for some niche cards to be not only worth pursuing, but change the entire way you view the draft.
Personal Librarian - Every player starts the draft with a Cogwork Librarian.
Companions Unchained - All companions are played as per pre-errata
Archetypes
The archetype philosophy in Manticore is less about providing each color pair with a distinct flavor, and more about enabling synergies and even decks from throughout magic's formats and history that I greatly enjoy. At the same time, it aims to keep cross-pollination as high as possible to avoid railed drafts.