Sol Ring is a frequently sought after foil, and since the judge foil printing there have been 2 other foil versions
Mason orders us to use Horn Attack to attack Machop
If you want to play a more aggressive build, another option is to eliminate the Erhnams altogether in favor of more 2-drops like Elvish Archers (and more Argothian Pixies), and possibly even Old Man of the Sea for some creature control, or Citanul Druid or Gaeas Avenger if your metagame is laden with artifact-based decks
A major factor in the deckbuilding process is trying to cut down on variance between games
So two of you are now down one card each and the other two have developed a little card advantage
Although the deck suffers from a lack of board wipe protection, cards like Bladewing the Risen and Teneb, the Harvester can easy return them back from the dead to pummel our opponents repeatedly