I'm playing Master atm
Just I say my normal play style that usually works.
First of all I usually enter a battle sneakily, I use the nightengale cloak to go invisible why crouching, I then use the nightengale bow with glass (or whatever arrow I have available) to shot my first target, usually an instant kill, so because of that i pick my target very wisely, who is closest, who is going to cause the worst outcome.
As soon as I'm spotted I switch to my mage, which is my most used combat tactic. I am a high elf so I get +50 magicka, I also have Archmage robes, Morekai and mage inducing jewellery (my armour is all mage oriented) which gives me +200 magicka and +350% regeneration. I also have highborn which is a power that increases my magicka regeneration by 100%.
I am a destruction mage, but I also specialize in restoration, conjuration and illusion. My primary attack is lightning bolt, I double hand it and have an ability which stuns any enemy I hit for a few second, with highborn, by the time they are up and ready to fight I've already completely regenerated my magicka, meaning if there is only one enemy, it is impossible for them to kill me.
I very rarely use melee but when I do I use a glass greatsword (yeah, glass doesn't seem the strongest...) and I use the mace of molice, which also fills my soul gems if I kill someone with it.