30 Artifacts is a lot, no doubt about it, but his ability to make several treasure a turn make it viable to do
In a perfect world, you play it on turn 3, tap it for 4 mana and 4 life on turn 4, and play an 8-drop
Beat your opponents & rank first at every battle
Not only does it make cards scarce for TCG players, but several cards from the Scarlet & Violet era are astronomically expensive
Rhoda, Geist Avenger + Timin, Youthful Geist I applaud Wizards for expanding the design space around tapper effects in blue and white, but they're often just not strong enough to justify an entire deck themed around them
I think this Vivien looks great on paper just the like past 3-drop Vivien, but wont live up to the hype when actually played