Ward is an excellent source of protection, and so long as it's going onto a legendary creature, equipping it is something that you can easily do the turn you cast it
Crazy Fish
If you thought getting smacked by your own commander was bad, try sitting there and watching some lucky opponent have the next two or three turns
Each deck had a wall card to support its assassins in the air, and we found that Tranquilize did a lot of work in preventing our opponent from using theirs
There are, of course, right and wrong ways to do it but they have less to do with rules and more to do with how clear an image reads to the viewer
The easiest way to blend this is to make a 2- or 3-color legendary creature that cares about something very specific, or that can be used in Limited to drive new draft archetypes, that boost a certain Standard deck, or inspire the creation of a new EDH deck