The starters in this one are Johto, Unova, and Galar, and my top chase set would be the Chickorita, Cyndaquil, and Totodile pack
Jurrac Gallim X FIRE Level 2 [ DinosaurTunerEffect ] ATK 1200 DEF 0 When this card is destroyed by battle and sent to the Graveyard: Your opponent can discard 1 card to negate this card's effect, otherwise destroy the monster that destroyed this card
Timeless Lotus can also be tapped to cast your commander, making it another great option for this deck
Most of these effects in newer constructed formats, like Yathan Roadwatcher, have casting restrictions for a reason
A fourth, smaller but common, is forgetting to attack with the leader herself: Yamato has Rush as a leader, so that attack is free every turn, and skipping it is a missed point of pressure, not a safe pass
The other featured preview card from Wizards of the Coast is in this article by Adam Styborski