i know this concept has been shot down on multiple occasions, but this isnt for the immediate game. this thread is for the future (when elements isnt hassled so much for new cards), or when elements has calmed down enough for people to honestly consider 2 new elements (because you cant have an odd number of elements, notice how all of the current ones have opposites?)
machinery
the main ability in this one could be:
mass upgrades (evolution)
afterlife (spirits, ghosts, reapers, etc.)(not death, from what ive gathered, death deals with the physical world, this however is an element dealing with what happens after death.)
the main ability for this one could be:
possess (sacrifice a stong ghost [name not decided yet] to take control of an opponents monster [steal it]) or
haunt (lowers atk stat)