To have any chances of competing, a deck cant just be good, it has to be good enough to compete with the likes of Cori-Steel Cutter
You, under optimal circumstances, need an extra card to kill your opponent (Show and Tell, Omniscience, and your kill card, or in more common builds, Dream Halls, blue card, and blue kill card), but when you acquire that card, youre almost never giving your opponent another turn under normal circumstances
The train heist in A train to Prosperity and just everything that goes wrong
Board wipes have long been a staple of the Commander format, and you'd be hard-pressed to find a well-tuned Commander deck that doesn't include at least one Whether you want to open your way to win, or just keep an opponent at risk of running away with the game at bay, board wipes are some of the most essential cards you can run in a deck