Been some time since I came here. lol
I'm a heavy player of iM@S in WS, and despite the overpowered newer series, I still stick to neo standard iM@S (S07 + SE04 + S14). I've built and ran many kinds of iM@S decks, but my two main decks are still the blue/red defensive deck and the Futari twins deck. Not the Dearly Stars Ai or Ryo decks, surprisingly, even though I have them.
Current CollectionAnd even though IM/SE04 has only three yellow cards, the twins card is useful in most decks, and the Yukiho 1/0 backup is very handy in an Ai deck. The Iori card, however, is another matter. lol
There's a few kinds of yellow decks possible. I've made and ran an Iori deck, a Clothes Change deck, a yellow/red soul rush + salvaging deck, and even a Yukiho deck, but the only one that stands strong is the Futari twins deck. During its time, its packed full of power AND soul, and is something to watch out for. Now, however, I was forced to mod it to focus on soul damage as its power level cannot match the newer series.
For a red/blue Haruka/Chihaya deck, its more towards a defensive deck, one which can hit fairly high power levels with backup supports on opponent's turns. My current deck can easily reach 8500 at level one with backup, and that is against players who are generally aware of my characters' abilities. If push comes to shove, with a full level one front row, I can set the support up to rev one of them up to 10000 power after counter step, and that's not even involving the RR Haruka. At level two, I've ever pushed one of my character up to 15500 power during counter step. But usually, the general power level hovers around 12000 to 14000 after backup. And the best part? This deck is versatile enough to allow some form of card control for your hand, stock, and even library.
If you are interested in my deck lists, let me know. But be reminded that my decks are tuned to my playstyles, so you might have to retune the list to suit your own playstyle.