If youre playing purely starter decks, this one from Shimmering Skies is a good choice and can win consistently
If you are unfamiliar with concepting, it's the process of assigning creative flavor and writing art briefs for each card in the design file
On the flipside, you could build a Y'shtola deck that doesn't focus on this Creature package at all, and you can win the game through alternate conditions, whether that's by dealing enough damage with Y'shtola herself or casting cards like Sheoldred, the Apocalypse, Bloodchief Ascension, or a personal pet card, Approach of the Second Sun
Remedy that with equipment or Concordant Crossroads, and you have a self-reliant (yet unselfish) one-card milling machine
Whats more, if the Trawler is attacking, youre getting more cards
You cant always win