The spellcard system in IaMP is the best system I've ever seen for supers in any fighting game, ever. It restricts when you can actually use them, but being in spelltrance effectively means you get to go all-out for its duration; especially dangerous given how easy it is to guardcrush with certain SCs. You recover health when you enter spelltrance, but at the same time you're left wide open for your opponent to play some serious wakeup games on you when it ends, potentially meaning a good player can guardcrush them right off the bat and waste their spelltrance duration.
And the magic circle/dimmed lighting just looks cool. :3