When some people get mad, they can gain great power, but for some power means bending the arcana the flows through the world to you will. 

Small Spellcasting

When you pick this subclass, pick three cantrips from the wizard spell list, constitution is your spellcating ability You can cast these spells normally and you can concentrate on them during your rage. While raging you can choose to cast one of the spells as a bonus action, but to do so you must make a CON save (DC 10) to cast them.

Arcane Aim

If you miss one of your spell attacks or an enemy succeeds a saving throw on one of your spells while raging, you can choose for you or the enemy reroll the attack or save. You can do this only once per rage.

Powerful Magic

When you gain this feature, pick a spell from the wizard spell list that can be cast as a third level spell. You can cast that spell as a third level spell once per short or long rest. You cannot use Arcane Aim on this spell.

Arcane Absorption

Choose a spell that can be cast as a second level spell. Whenever your hit by a spell or magic weapon, you can use your reaction to cast that spell. You can change the spell every time you level up.