Broken Sacrament

Casting this spell immediately expends all of the targets spells slots which are of a level below 9, and removes their ability to use cantrips for the duration. For the next five minutes, they gain the following effects:

• The target gains a flying speed of 120 ft.
• If previous use of the Wish Spell rendered the target unable to use that spell again, the prevention is nullified for the duration of the Sacrament. However, it returns after the Sacrament ends.
• While the Broken Sacrament is active, the target immediately and permanently nullifies any and all anti-magic fields they come into contact with, with the exception of an anti-magic field caused by a Sacrament coming to an end (see below).
• The target gains a theoretically infinite number of 9 level spell slots, with which they may cast any spell from any class spell list as if it were from their own class list (with the exception of the Broken Sacrament spell). Spells cast in this way do not require material components, and if they would ordinarily require longer than 1 Action to cast, they instead only take 1 Action.
• Every time the target casts a spell during the duration of the Sacrament, they must roll a d20 immediately after. If the result of this roll is equal to or less than 13, the Broken Sacrament, and the target immediately dies. If the inciting spell is the Wish spell, the target makes this roll with Disadvantage. 
• If the target does not cast a spell at least once every Round (in a manner similar to a Barbarians Rage), the Broken Sacrament ends.

Whether or not the target is still alive after the end of the Broken Sacrament, the massive vacuum of expended magic transforms their body into a localized anti-magic field, removing the ability of any creature (including the target) to cast, utilize, activate or be affected by any kind of magic while in physical contact with the target. This field lasts for a year and a day, multiplied by the number of Spells the target cast during the Sacrament (e.g. five 9 level spells = 5 years and 5 days), and cannot be dispelled by any means up to and including the Wish Spell.

P.S: When a soul (which may be that of the caster) is expended in the casting of this spell, the DM is at full liberty to decide how the absence of a soul affects an individual. 

P.P.S: If the soul being consumed by the spell is not willing, the soul must be contained within a vessel that the consumed soul has no physical control over (e.g. a Jar, as with the Magic Jar spell) or else the Sacrament spell cannot be cast.