I love the idea of the summoning, reminds me of Lost Kingdoms. The LP is very similar to Ki points with the Monk. There is the problem of damage scaling though. And there's also that the mage doesn't really have any options besides drawing a card and casting. They have light crossbows, but that's DEX based. I would give them access to 2 cantrips.
I also like the idea with the suits representing different things. Either a suit could be used to represent different classes (Wizard, Sorceror, Warlock, Cleric), or could be used to represent a different school of magic.