[@Lucius Cypher][@Dark Light]
Thanks for mentioning your concern on the matter. I was comparing spells Shillelagh and Magic Weapon, and I suppose I was thinking too much of the can trip. But if we were to make it a 1st level spell, what do you two think of the following:
[*]The weapon must have a property to allow it to change.
[*]Can only change one property at a time and requires a bonus action to alter that one changed property.
[*]Must be a non magical melee weapon.
[*]Last for a minute with concentration.
[*]No "thrown" property as I imagine this spell to change the mass and density, which causes the shape of the weapon to change.