A temporary ability allowing the character to see what items visible enemies have for 5 seconds would be more appropriate for a skill imo. You lose sight as soon as the ability ends
There is no need for the character to be pure support, and I don't think pure support characters are particularly appropriate for the game, even Sedna and QoT who are very close to being support characters can hold their own in combat.
I do like the general gist of where you're coming from though.