9 gold minion for a 4 gold price, yes. But it's totally random and a hug chance of getting a worthless one. I have not once received a useful minion out of Eudora. And if you do, that is the payoff against being behind 3 times for having to spend 1 coin and therefore be weaker than other heroes who had more mana to spend.
Well, the statistics disapprove your theory.