You are infused with wild magic. When you finish a long rest, roll a d20 and consult the wild soul spell table. You learn the spell specified on the table. In addition, you can cast this spell without requiring a spell slot or material components. When you cast the spell in this way, your spellcasting ability is Constitution. In addition, when you cast the spell in this way, you must roll on the wild magic surge table. 

You can cast the spell in this way a number of times equal to your proficiancy bonus, regaining use after a long rest. When you learn a new spell from this feat, you loose any spells you had from this spell previously. 

Wild Soul Spell Table