I have the season 4 combat triumph but it wont let me reacquire it from collections. i swore i got the shader from shaxx in season 4 and had it on a redrix broadsword i got am i mistaken or is it bugged? is there any chance it will comeback because its my favorite shader in the game.
Shader being on a piece of gear does not count as being discovered. The shader needed to be in your character's inventory or in the vault at the time Collections were introduced (Warmind DLC release), otherwise it would not have been added.
If you don't have it in your Collections, it cannot be obtained again, unless it will return at some point.