Chiseled

So sayeth the scholar Nas The Wise "Without the mind, the body weight don't even mean nothing."

An attempt to make the buff wizard archetype

Level 3: Might and Magic

You can now use your intelligence modifier for unarmed strikes instead of your strength for both damage and attack rolls. Your unarmed strike die is now a d6.

Also, whenever you cast a spell that deals fire, cold, lightning or acid damage, you can channel that element into your fists allowing your next unarmed strike to deal that type of damage instead of bludgeoning. If multiple spells that deal one of the aforementioned damage types is cast before your next unarmed strike, you may channel only the most recent one.

Your hp is also increased by 2 per level in this class.

Level 6: I may be out of spells but i ain't out of options

For every spell slot consumed you gain an additional +1 to all your damage and attack rolls with your unarmed strikes. Your fists are now magical weapons, and you can now make two attacks as part of the attack action. When you take the attack action on your turn, you can cast a cantrip as a bonus action.

Level 10: Brain Bolstered Body

You may now use your intelligence instead of strength or dexterity when making any strength or dexterity based skill check. 

Your intelligence saving throw bonus can now be used in place of your Strength, Dexterity and Constitution saving throws.

Level 14: Muscle Memory

You can now cast Enlarge/Reduce at will, targeting only yourself. It is always prepared and doesn't count against the number of spells you can have prepared. It also no longer requires concentration.