While it's a fine card and scales throughout the game, there are a ton of graveyard-centric / reanimation decks in Commander, and it seems unlikely that Gyrus, Waker of Corpses will beat out most of the pre-existing options outside of something like Jund Hydra tribal (and then, it's not even that good with many Hydras since they are X-creatures, which won't work with the reanimation ability)
Even though there are multiple Tuners, there is only one Synchro Monster, Ukiyoe-P.U.N.K
The copy is an Illusion and isnt legendary, so it sidesteps the legend rule entirely
They overlap a lot as to what they offer, which is good for our purposes
Of the remaining 54 nonland cards, there are 25 total cuts that I would make to get the engine really revving, mostly considering efficiency or impact
Beginners looking to assemble an effective deck will usually be better off acquiring their most important deck staples first