I am an advocate of this being top-tier now that the attack meta has shifted, but with the stipulation that this is STRICTLY anti-meta. If there are a lot of spin stealers this is NOT a safe pick, and we need to also remember that while this does well against one of the most powerful attackers out there, the fact is that far fewer people have two Wyvangs than Flash (especially since the Hyperblades release). Now, this custom does do well against most Flash customs, so if you know your meta it can be a solid choice.
What I'm getting at is that I think this is top-tier worthy, but more because it does well IN THEORY. If your meta is Synchrom attack heavy, this guy can get the job done.
EDIT: To address an earlier comment, yes, (MSF-H) Wyvang Wyvang H145(RF/R2F) would give this hell if it is an effective track for Wyvang^2. (Somebody should totally test H145 and see if it's good or not lol)
What I'm getting at is that I think this is top-tier worthy, but more because it does well IN THEORY. If your meta is Synchrom attack heavy, this guy can get the job done.
EDIT: To address an earlier comment, yes, (MSF-H) Wyvang Wyvang H145(RF/R2F) would give this hell if it is an effective track for Wyvang^2. (Somebody should totally test H145 and see if it's good or not lol)