Stuff like Snuff Out or Dismember are already heavily played cards, but here, you get to draw a card from them because you lost 4 life, and you also get to drain your opponents for 2 life, offsetting your life loss
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Magic has had Mana Dorks since the beginning, with the cards Llanowar Elves and Birds of Paradise getting printed in Alpha
While this can provide some additional value, Jirina's most notable ability is the fact that this card provides all other Humans under your control with +2/+0
Feast of Sanity Feast of Sanity doesn't look like much on its own, but in decks all about discarding cards -- Wheel and Madness -- it can be a powerful removal / finisher that keeps you alive while wiping everything out
Those decks are fine with that since they're often built to win that way, but cards that give the pilot a slight edge like this are refreshing