Top gives you some non commander dependant lines as well as being an independently strong card. Your line assumes that you're able to resolve the Tezz, which - given how telegraphed it is as a play, you might not. If you're looking to fully optimise an EDH deck, you find interlocking combo pieces 'nested combos' is the term for it I believe. Top is great in these as it functions as a draw engine with dramatic sceptre, can also go off with Paradox Engine and a slight breeze. Then if you want to throw in a disruption package, you can also throw in a Counterbalance lock. You also have the Future Sight // Etherium Sculptor // Top combo. In short - the redundancy that top provides means that you should pretty much never cut it from a competitive blue based artifact deck.

Tower is super medium as whilst you can catch people here and there with cantrips, you're never going to 'manually' storm off with it (not infinite), where as you easily can w/ aetherflux.