It's probably actually going to NEGATIVELY impact Elemental HERO decks, actually, since people will be using more copies of a card they shouldn't be using.
I always thought that people was being ironic asking about clayman, but then I saw some using it. Guys, clayman is bad. I love elemental heroes and clayman is a option that probably will lead you to lose even on gold.
That's the thing though, if it is not that good, then why it is restricted to 1 copy? It makes no sense, it should have been at 3 copy since a long time ago.