It's hard to do something that has been done multiple times before, do an enchantment-matters theme
Target creature gains trample and gets +X/+0 until end of turn, where X is its power
Seriously, though, to the extent that product fatigue is real, I hear about it most clearly from Magic boomers who speak wistfully of the days when they knew all the cards, which of course makes Commander easier to play
Tezzeret the Seeker is good for putting big artifacts into play, so you should get Clock of Omens, The Seriema, The Aetherspark as prime targets
It was at that point that he should have himself switched to Affinity
You can technically do this without spending any money/gold/gems and just open packs you get for free while playing the game