Thats the secret to building a good typal deck
You can have a key turn where you play some enchantments, trigger Monastery Mentor a bunch of times, and slap Ethereal Armor on something for the win
Ironically, she's better in the 99 of Silvar, Devourer of the FreeSilvar, Devourer of the Free and Trynn, Champion of FreedomTrynn, Champion of Freedom, the secondary commanders of her precon, because they both add to Jirina's count
The premium is driven by higher print quality, better PSA 10 rates, and Japan-exclusive rarities like Master Ball foils and MUR cards
I suggest running the third Snapcaster Mage, as this will allow you to cast even more of those precious Red Elemental Blasts in the match ups where they matter, leading to a serious advantage in said matches
For example, in Outlaws of Thunder Junction boosters, you can find cards like Notion Thief from Gatecrash or Stoneforge Mystic from Worldwake