The second effect calls on Joeys favorite gal, Lady Luck herself
Once you've announced that you're applying a card's dredge ability to replace a draw, players can't take any action until you've put that card into your hand and put the top cards of your library into your graveyard
You then gain life points equal to half that monster's attack value
If an effect causes a creature with changeling to become a new creature type, it will be only that new creature type (unless the effect says "in addition" or similar)
That sentiment has already been lurking in the darker corners of the Magic Internet, and if we end up with a sequence that looks like unban Jace, sell Masters 25 , reban Jace, the perception that Wizards cares more about short-term profits than the long-term health of the game would be quite problematic for Wizards
I did a quick search on eBay and there are currently over 160,000 Pokmon cards for sale so they definitely have a huge market