Order Eternal Masters now
While there are build-arounds, it looks like you should be prioritizing the cards with the mechanic first, as they stand so well on their own
In the late game, the Smith can be replayed over and over with Lurrus of the Dream Den making it a useful source of card advantage
My Verdict: Dont be fooled by Umezawas Jittes unassuming appearance: its a Swiss army knife that can cover a lot of situations
If the stacking issue proves problematic, however, we could just use more Viridian Corrupters or whatever
Pick a commander that fits your table Alela for tempo, Tegwyll for budget, Oona for nostalgia lean on Bitterblossom and the flash package, and tune the ratios until the curve sings