Torterra #17 (Pokemon Diamond & Pearl | Pokemon Cards) prices are based on the historic sales
One nice thing is that, for the most part, you won't be penalized for a bad roll
Now the CMC of split cards is always the combined CMC of both halves, EXCEPT while the spell is being cast and on the stack, where only the parts paid for are counted
Of the four revealed, I would peg Meowth ex as the most valuable given its universality in the Pokmon TCG competitive scene right now, with Mega Starmie ex a close second
Are you looking to collect them for yourself
It's MH3) most likely to pick this up are Scam and UR Prowess, which often want to use mana as efficiently as possible and care about clearing the many, many Karnstructs Urza's Saga produces