In the past, Tezzeret has traditionally been blue or blue/black, so it is interesting to see the character now represented as colorless
You don't play to win, you play to survive the story you're writing
She makes her first visual appearance in the game with the Onslaught card Akromas Blessing where she is seen defending some Daru nomads in battle (presumably against Otarias Cabal), though she doesnt get her first mention in flavor text until the card Infect (also in Onslaught )

Quandrix students, help me count to five: Primo, the Unbounded, which I will absolutely be building, introducing the first-ever base-power-0 matters commander that builds big Fractal tokens when creatures with 0 base power deal combat damage Yavimaya Bloomsage, the only creature in the prepare cycle to feature a flat-out banned card in Channel, made ready by putting a +1/+1 counter on a creature that subsequently has power 7 or greater Owlin Spiralmancer, a powerful creature that copies the first X-cost spell you cast every turn (including on your opponents' turns) Nexus Mentality, a member of the highly exclusive club of cards that can move counters between nonland permanents (sadly, this doesn't let you rip counters away from Dark Depths) Turbulent Wilderness, the final land (for now) in the Turbulent cycle When it comes to blue-green, it can sometimes be difficult to build a deck with a cohesive theme that doesn't lean too hard on broad themes like +1/+1 counters or Lands Matter

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Perhaps you haven't quite gotten started yet after the recent rules change in Yugioh allowing double-sleeving