Discard already suffers from doing nothing on an empty hand, the fact that Duress can still do little on a full hand means you have to be quite careful how you build with Duress and where
This lets you discard a colour or land of your choice to transform Viconia in one of five different ways
FromTheShire: Shocker about this newest cycle of free spells, they're really damn good
If nothing else this will accelerate your games by increasing the mana available and lowering life totals
If it changes zones, it will either cease to exist (if it's a token) or cease to be a copy (if it's a nontoken permanent), and so you won't be able to cast it as an Adventure
Conspiracy Unraveler I do my best to delay gratification and get to Omniscience, but with a full graveyard and 3 mana earlier, Conspiracy Unraveler is quite a leap in that direction thanks to collect evidence