No biggie, this topic is ancient and deserves discussion. My first serious farming deck was an MA too x) I made tons of electrum beating up HB's.. it's a good thing I was able to move on to FG's before the AI got smarter and this deck's winrate dropped. However, now it's back since HB's have 50 less HP
That said, it can still be improved upon by using SoW's in place of Immortals, adding a Lobo or two, and readjusting the quanta balance. However, as mentioned, this topic is for the complete newbie, and they don't have rares.
Aye, this type of MA has been a classic deck ever since Phase Dragon was made immortal. It continues to be one of the strongest decks against all AI opponents and PvP alike.