The cost-reduction ability of Korvold, Gleeful Glutton doesn't change its mana cost or mana value, only the total cost you pay
Its definitely a gorgeous card in terms of its artwork and the foil finish you find on Special Art Rares
An esteemed fellow collector and E4 member has written a very detailed article about the FPO cards, which can be found here: FPO - For Position Only Cards Official Guide (Additional photo upload pending) Matchprint cards These cards were used for color proofing before their set officially went into print
Q: What are the different types of jump starters
Holographic and full-art cards are slightly thicker, closer to 0.014 inches , because of the extra foil layer
Playing around TM Devolution is interesting, as its usually perfectly possible, but requires restraint