Based on the hand it gotta be Bakemon or Soulmon. The only other type of hand similar is Wisemon's, but even then is different enough from it. It also wouldn't match the tone of the episode, being all about spirits of the dead beckoning you.
Honestly, about time! The ghost digimon definitely should make an appearance in Ghost Game.
Edit: in fact I am almost convinced is Bakemon, specifically. We see Kyo trapped in this grey version of the world and later on Jellymon by his side on what seems like a hospital bed. I think that will be Bakemon's Hell's Hand move, which pulled him into "hell".