They typically affect a subsequent spell rather than a creature as the first group does
Toss in the fact that Thalia, Guardian of Thraben already has several printings including a WMCQ Promo with unique art and I'd guess that the pricing of the different versions of Thalia, Guardian of Thraben will look much like the pricing of the different Secret Lair printings of Serum Visions with the one with the most desirable art being slightly more valuable than the rest, but the total value ending up right in the $30 or $35 range
The potential to scale up the activated ability is immense and pulling off two nontoken creaturefalls is exceptionally good
One rule Im trying to follow here is trying to make a list thats more obviously polarized into reanimation targets and delirium enablers
(that is also true for all the dual lands, but even if you are on a tight budget I recommend keeping Clifftop Retreat in the deck - they are only $4 each.) Planeswalker/s Gideon Jura - A card I've recently added without play testing but I figure that all his abilities are relevant
Whats more is that Kit Cloudkicker, Navigator has the Ward keyword too, meaning that it cannot be targeted by opponents unless through a challenge: thereby giving it even more longevity and thus even more opportunities to quest for three lore a turn
