Destiny's Blade

The blade of the sickle, dagger, or axe you are holding is warped and wreathed with your magical power. For the duration, you can use your spellcasting ability instead of Strength or Dexterity for the attack and damage rolls of melee attacks using that weapon, and the weapon's damage die becomes a d8. The weapon also becomes magical, if it isn't already. The spell ends if you cast it again or if you let go of the weapon for longer than one round.