The Magical Fist

You are a master of punching and spell casting in that particular order.

Mage Fist

Your a real man now and gain the following benefits:
When you make an unarmed strike your new die is a 1d4 and you add your intelligence modifier. For resistance purposes dis is considered magical damblage. This damage increases to a 1d6 at 6th level and 1d8 at 10th: finally ending at 1d10 at 14th.

Your Fist is now your Spellcasting Focus but only if you have nothing in either hand and are not wearing armor. 

Mage Fist 2 Electric Boogaloo

For the Magical Fist user punching takes priority over everything else. You gain the following benefits when fighting unarmed, unarmored and with nothing in your hands.

You gain a magical barrier of mystical masculinity. Your AC when unarmored is now 10 plus your Intelligence Modifier.

Your Fist are now considered weapons and can cast weapon spells out of them and gain the benefits of weapon spells. (Green Flame Blade, Booming Blade, Magical Weapon Etc.) 

After making an Unarmed Strike you can use your bonus action to cast an offensive cantrip from your off hand as long as it's in a fist.

Brain over Brawns, Fist over All.

Total devotion to the fist has greatly increased your power to new levels you thought previously impossible. You gain the following benefits when unarmored, unarmed and nothing in your hands.

Your Magical Masculinity Barrier now also adds your con modifier to the total score. (10 plus Intelligence Mod plus Con Mod)

 After making an unarmed strike you now add half of the total damage rounded up done as temporary hit points till your next turn. 

You can now add your intelligence modifier on any spells cast from your fist.

The True Way of The Fist.

It's time to unleash the true power of your fist on all who would challenge you. When you gain this Feature you can now add the spell Bigby's Hand to your spellbook and you can cast it without components. 

You can also cast the spell once without expending a spell slot. After you do so, you regain the ability to cast the spell without a slot when you finish a long rest.

After making an Unarmed Strike and Bigby's Hand is out it gains the following Modifications Listed Below. 

It can attack with the Clenching Fist option as a Bonus Action. 

Unless specifically directed to move elsewhere Bigby's Hand will follow you and stay by your side and return after making an Unarmed Strike.

This is the Fist that will Punch the Heavens.

You have now become a true paragon of punching. You gain the following benefits at this level.

After making an Unarmed Strike you can now cast an offensive non bonus action spell as a bonus action. You can use this feature a number of times equal to your intelligence modifier (minimum of 1) and you regain all expended uses after a long rest.

You're unarmed strikes now overload opponents with mana making them take disadvantage on the next spell you cast against them. 

After casting a spell or cantrip from your fist you can opt to use your reaction to make Bigby's Hand immediately use the Clenched Fist attack on one of the targets of your spell or cantrip.