If you want to optimize GK deck, try to grind 2 more Chief. Remove 1 Oracle and 2 Spearsoldier, add 1 Kuriboh. Replace Mirror Walls/Twister with Soul Exchange / Double Summon. And also, you can counter relinquished with e-con take (tribute using Recruiter is the best).
Take out the spear soldiers entirely. Get Soul Exchange and replace your twisters with them. Mirror wall is largely unnecessary due to Oracle and Recruiter searching him so take those out. I like to run a single Legion the Fiend Jester as an alternative way to get out Chief. Add one or two more Chiefs as he is the play-maker of the deck. You never want to run less than 2 and some even run 3.