Kamikaze dagger

Weapon Light, Finesse, thrown(20/60ft) Uncommon [Attunement required]

This dagger is a +1 dagger that comes with all the benefits becoming of a +1 dagger except it has a few spells on it.

This dagger has a pool of 3 points, and it knows 3 spells that have different costs. Any spell save is a DC 14
Grease - 1 point
Otto's resilient sphere (both end up inside the sphere) - 2 points
Fireball - 3 points

The points are regenerated at dawn

You must declare the spell before a melee attack, and if you miss or the attack is blocked, the spell fizzles out. If it is a hit, it casts the spell centered on you. You and the thing stabbed have disadvantage on any saving throws required by the spell the dagger casts. The thing you stab must be hostile towards you.