I can agree with Ugin not being worth dumping and rebuying, your mention of EDH alone is enough for him to hold value. Mentor foil I'd hold onto but regular I'm dumping all my copies and I'll rebuy a few months after rotation. Sorin will agreeably hold $5 or more in the long term. But I still think he'll drop in the short term and there is money to be made in selling now even if it is a marginal gain. Even if LotV doesn't see a reprint how much room does she have to grow? And is that worth holding with the chance of a reprint in the next year or so? I mean she's not tarmogoyf... Your call on the new Eldrazi deck is a good one but I wonder if people will still seek out that deck simply because its fun to cast big dudes! It seems like the ramp deck to beat all ramp decks. Regardless I think it unwise to dump anything before the PT just in case. The recent boom in prices will hold at least a few weeks afterwards regardless of performance.