Unpredictability (Spell Version, Now for a Friend)

Pick a partymate. The next time they attempt to use a spell, a random one will be used instead based on a dice roll. A roll of 1 will activate their first slotted spell, and so on. If a roll is for more than the amount of spells they have, they must reroll until a spell is selected. To activate this spell you must shout "My Friend's Spells are Unpredictable!"