Like the flavor text says, The demons yoke is part leash, part noose. Yes it is
None of the cards can be considered for cube, since for the few cubes that do have a shard section there are better options in Jund like [card]Hellkite Overlord[/card] ([card]Reanimate[/card]/[card]Natural Order[/card] target) and [card]Broodmate Dragon[/card] (value), though Prossh may synergize better with a list supporting a sacrifice theme
When this Aura enters, enchanted opponent creates a Clue token, a Food token, and a Junk token
If a modular triggered ability would put one or more +1/+1 counters on a creature you control, that many plus one +1/+1 counters are put on it instead
If so, there are a number of options for who we might see next
Dont be frightened by the aggressively high mana costits paired with an equally aggressive mana reduction ability