While the keyword protection existed earlier, that mechanic is much more brutal in its purpose and a significant combat boost in providing immunity against a whole color or card type
Do the same with a Great Oak Guardian and you could make all your creatures infinitely big at the same time
Our suggestion is to include either more creatures that have a base power of 1 (to give Zinnia more fighting power), or insert creatures that have strong enter triggers
Also, fun aside, I only played with that Savra deck in a single cEDH tournament in the basement of a midtown comic book shop that sadly no longer exists (if you know you know)
Best Selesnya Token Commanders (Rhys the Redeemed, Trostani Discordant, and Emmara, Soul of the Accord) Selesnya was really the first optimized selection of colors for token decks in Commander (then EDH), and credit for that falls squarely on Rhys the Redeemed
Lands like Command Tower, Path of Ancestry, Unclaimed Territory, Secluded Courtyard, and the tri-land package ensure smooth five-color access