The Benevolent Lucky 8-Ball

Using Exalted Blessing magic, you create one floating magic 8-ball. You may use an action to bestow the 8-ball upon a willing creature within range. If no creature is within range to receive the 8-ball it ceases to exist. The 8-ball then orbits target creature in a fashion similar to an Orb Weilder's orbs. This 8 ball acts as a magic item, containing 8 charges. An 8-Ball with unused charges ceases to exist at the end of the 8 day duration of the spell. 

Only the good aligned may posess an 8-ball. A creature may only possess one 8-Ball at a time with zero exceptions, aside from the god of luck who is always in possession of 8 of them.

Whenever you make an attack roll, an ability check, or a saving throw, you can expend one charge to roll an additional d20. You can choose to spend one of your chargess after you roll the die, but before the outcome is determined. You choose which of the d20s is used for the attack roll, ability check, or saving throw.

You can also spend one charge when an attack roll is made against you. Roll a d20 and then choose whether the attack uses the attacker's roll or yours.

If more than one creature spends a charge or luck point to influence the outcome of a roll, the points and/or charges cancel each other out; no additional dice are rolled.