In addition to the ex versions of the Loyal Three which follow the standard rarity (one double rare, one ultra rare and one Special Illustration Rare of each), we are also getting Illustration Rares of the Loyal Three cards that were released in Twilight Masquerade
Legacy: Every Magic set is legal in Legacy, including Commander decks
2 Venusaur: Base Set (Shadowless Holo Rare, 15) $1,015.75 Reject The Modern Design, Embrace The Chunky Toad Generation 1's starters are some of the most universally beloved icons of the entire Pokemon series and while one usually outshines the others with love from The Pokemon Company, the other two still get plenty of love from the community
The only limit on the deck size is that you have to be able to shuffle it on your own without assistance, and that your sideboard can be no larger than 15 cards
I hope this article helps you upgrade your decks
Cards like Stoneforge Masterwork do an exceptional job of this while staying very on-theme