Just a word to let you know that I enjoy Lost Portal. The game feels a lot like Magic, only simpler and less rich, but with an added layer of light rpg and player progression. The IA is not that smart but it gives a solid challenge. My only real beef with this game is that once a level is cleared it never refills, leaving my hero out of target. The fact that there is no way to grind some XP is both a very good thing (you really have to tune your decks to beat your foes as they are always just a little bit stronger than you) and a bad thing (no easy way to test your new decks).
Give it a try!