Just out of curiosity, what Mtg card is that pic from, I used to play Mtg soooo long ago, it's been like 7 years.
Anyway, as for the actual character, you need to put more information for the abilities, cast time and cooldown.
Invisibility is an idea I'm sure many people would hate, and this skill would need to drain WAAAAAY more than 15 mana a second at level 1, more like 75 or something like that.
Backstab is extremely overpowered, especially at level 4. 1500 damage + 2 second stun for 600 mana? Lower damage by half or something.
Need a range limit on Seek and Destroy, if it had like a 50 yard range, that would be OP.
I agree with the first poster that Slight of Hand is a really bad idea, 40% gold steal is ridiculously OP, gold steal would be a really bad mechanic at all, unless it had major drawbacks or was really situational. Breaking bank is a bad idea too.
So in conclusion, almost everything there is overpowered.
Invisibility could be abused way too much, especially if you can use items in it, and a stealth based demigod would be a bad idea, unless they could only go invisible for like 5 seconds.