Deck builder and simulator of Weiss Schwarz. You can make your decks and test them.

List of Decks which win big tournaments. You can simulate those decks.
The deck used in Worlds in Japan to take 5th Place.
311.60 969 testplaying 【2-1】 10 participants
Neo Standard Local 28/02/2016 - Odivelas (Portugal) 1st Place Player: Nuno Carvalho
266.34 471 testplaying 【3-0】 7 participants
Pre ban list LSS deck. I built this deck just a few days before the new ban list and beacuse the ban list comes into effect on the 1st of March I decide to play one last time with this deck before I need to change the list.
473.98 1 testplaying 【6-0】 12 participants
Deck is pretty simple to play. Use Kazuma to get wind trigger into hand if needed, use level 1 combo to maintain handsize and focus on grabbing cards you can play next turn. Try and have at least 1 Vanir or Masked Darkness in hand by level 2. If you hit level 3 and have the stock soul climax use the level 3 darkness combo or triple field vanir and hope to change into 3 masked darkness to survive following turn with her scry. Use stock souls throughout the game to build stock as Vanir/Masked Darkness is your end game focus. Use early play Aqua as needed to stay at level 2 as long as possible.
40 testplaying 【4-0】 16 participants

List of Waifu Decks. You can refer them to bulid your waifu decks.

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250.19 96 testplaying
Wanted to go with a non-Lion build here, and I tried to use Yayoi as much as I could. Might change it a bit later to add the sisters to it. EDIT: Added Yayoi bottom deck bombs. I really like that card.
1 testplaying
191.04 87 testplaying
345.43 76 testplaying
966.69 10 testplaying
The red version of this deck has much less utility than the green, and therefore plays a much more straightforward game. You have beaters and card advantage at levels 0 and 1, a level assist and a "cute" 2/1 that can deal with annoying costless back-row characters (SAO, Yellow Schoolgirls, Love Live!, Haruhi/Aliens, etc.), and level 3 brings you an early-play healer and a very interesting finisher (burn for cost?). I think the idea is to try to stay at 2/4 until your opponent is at 3, then burn the hell out of them with your cxc.
198.06 78 testplaying