For now, here's a look at the most expensive cards from both sets right now, based on what I've found
Tourach, Dread Cantor Hymn to Tourach is an insane card to run in black decks, and having access to a creature with the same effect is absolutely amazing, despite the extra mana investment you have to pay to kick Tourach, Dread Cantor
Black & White's Victory Cup Reminds Pokmon TCG Players Of Not Winning The Victory Cup card was handed out to people who came first, second or third at various Pokmon TCG Battle Road tournaments between 2011 and 2013
(2023-11-10) Players can respond to a spell or ability whose effect includes proliferating
Sorcery Color tag templates(None) Launch the Fleet Strive This spell costs more to cast for each target beyond the first
For how useful it is, Magic has only reprinted it twice so far contributing to the card's hefty price tag