Archangel Avacyn does a fine job protecting your team from a Kozileks Return, and Verdurous Gearhulk can get a creature or two out of range of the Kozileks Return
The Eldrazi deck features a bunch of devoid spells of varying color costs, and of course for Commander, their casting cost denotes their color identity and thus their legality
That means we can enchant her into an unstoppable 1-shotter without ever spending a single mana casting an aura
If you cast a spell from among cards in your graveyard that were milled this turn using the permission granted by Raul's first ability and then have a new Raul, Trouble Shooter come under your control in the same turn, you may cast another spell from among cards in your graveyard that were milled this turn
I like the overall theme of three being used all over this card, and I think capping the recursion there is a healthy line to draw, as I could see this being insufferable if it could bring back anything