A PSA 8 on a $200+ card still holds value, but the premium over raw is modest (10-20%) PSA 9 (Mint): Nearly perfect with one minor flaw perhaps slightly off-center or a single corner with minimal whitening
I think the most interesting part of this analysis though is in theory if you owned each of the cards you would have had $22,965 of cards at September 2017, and three months later those cards would be worth $28,036
If you control a face-up "Ultra Space": You can Special Summon this card from your hand
These cards just increases the mana cost of your opponent's spells, and while Thalia, Guardian of Thraben is a symmetrical effect (it affects you too), it is an extremely good card to drop in Turn 1 or 2 while your opponents are trying to play mana rocks or ramp their lands
A Litten briefly appeared in GOTCHA
Those looking to sell their collections should not expect Charizard-level pricing for other cards from these sets