The best predictor is EDH use, especially since these are all legendary and likely to be Commanders for decks
Mistcutter Hydra : Gets a bit bigger, and his presence in the main will depend on how the metagame shakes out regardless, since Mono-U is likely done for now
There is an issue with first print run boxes that allows someone to take boosters out of the box without breaking the seal
He is banned in Commander, but legal in many formats, so where legal
It can safely be assumed that these decks are just going to grow in price thanks to their collector value
Counter Blitz - Tidus, Yuna's GuardianTidus, Yuna's Guardian Tidus is one of the best +1/+1 counter commanders available in our format, and he's got a solid decklist to back him up