Dungeons and Dragons

I'd like to give my party the ability to control an unstable godling in combat. Do you have any suggestions on how to make this fun?

I have four party members. I'm thinking that on the godlings turn, each party member will be able to declare a target enemy and an ability to activate. If more than half of the party members declare the same target, then the target is selected, ditto for the attack. If they fail to meet that bar, something random will happen to a random target (including the party).

They'll probably be fighting 7ish clerics and cultists, and the godling will probably have two-ish attacks.

Edit: Any suggestions on how to make the control more fun for the players? I want a strong element of chaos, but more than half of the attacks should be controlled by the party.

Here's the context: My party has gotten involved with an almost-extinct god that has been revived. It's an unstable bundle of power that throws off random miracles. It has manifested a set of curse/boons for each party member. The godling had a portfolio of growth, but it'll probably get rebirth/reincarnation.