Thank you for the reply! One other thing to note, more of a point of confusion, is that I'm never really sure how 'this card is multiple cards' will work on various effects. For instance, Wolf Pack counts as three cards, and The Hunt gives 'every' Beast card a 75% boost. I get that it would be busted if it worked this way, but with the way it's worded I did wonder if it would get the 75% buff three times, once for each card.
All I can think to fix this confusion is to add the Twin Idols expanded text to every card like this - 'counts as X cards for anything that counts cards or tags' - to clarify what this effect does.
I haven't seen every card yet so there may be other things that don't make sense (I have a card that effects the ROOT keyword but no cards that have ROOT on them), but this is just what I noticed so far.