Lockes greatest weakness as a commander is that Coram, the Undertaker has basically the same ability but with casual Commanders best color attached, while Locke gets points for Treasure synergies
I would also tailor the graveyard hate to include some targeted removal with cards like Deathrite Shaman, Scavenging Ooze and Moratorium Stone
Yet we still run board wipes in every deck, dont we
There are unbalanced Cubes on purpose: Players may design a 70% black cube for some reason and add the other colors in a smaller proportion, or design a cube thats mainly artifacts and colors that work well with the theme
It lets you tuck away a card with hideaway and then rewards you with Treasure tokens whenever you cast multicolored spells
Thankfully, there are tools available to help you find new tech most notably EDHRECs Advanced Filters