I used it and i have to say that i trust it less than NEX Miradante Twelve. At least NEX Miradante Twelve has discard resistance in the form of Baiken. When Rosia Miradante Twelve gets discarded heavily, you can't really do shit other than recycling spells using Miracle Star, time caster because everything the deck uses relies on the hand.
Secondly, it's really passive and while stopping attacks will work in real life because you do not see Magnums (All 3 kinds, Allshot, Fast Attack and Shortshot) running around but in TCO it does and it's also literally infested with Ramps or discard. Have to run Arcadia Spark, Super Eternal Spark and Miraculous Snare. It also does not spam as well as the other Mira12 decks as well, usually i end up with 3 or so blockers and a Neverlast when winning.
However it's very good at stalling attacks with Memento Guardian Shrine and Kernel and it can outstall many of the TCO hard rushes without Oriotis or Magnum. Memento Guardian Shrine also helps Dragsolution Neverlast and allows your creatures to beat back Oriotis which does not attack as well as get around walls of blockers. And of course it's also fun to use as well.
These are the following things it can deal with;
- Hard Rushes, best without Magnum or Oriotis
- Mid speed beatdown decks
- Invasion or Revchange Rushes without discard
These are the things it cannot deal with;
- Discard Control
- Adamski Deckout
- Loops/Giovanni (Nothing works against these)
The following is the Rosia Twelve i used;