Divine Intervention needs to be worded like Limited Wish from the Genie Warlock:
L11: As an action, you can speak your desire to your Genie's Vessel, requesting the effect of one spell that is 6th level or lower and has a casting time of 1 action. The spell can be from any class's spell list, and you don't need to meet the requirements in that spell, including costly components; the spell simply takes effect as part of this action.
Once you use this feature, you can't use it again until you finish 1d4 long rests.
Capstone: When you use Divine Intervention, you can choose spells from up to 7th or regain a number of Channel Divinity equal to half your proficiency bonus.