This deck is really fun, basically you just play the cheapest and most efficient threats/removal and then slam Tasbu/Timepiece to outvalue late game. Against any control decks the plan of Menace + recur Menace is pretty busted, the only MU I personally think is sketchy is into Shen-Ra speaks control (Combrei Relics).
You can run 2-4 shadow symbols at the cost of a fully active Champion of Chaos if you'd like, and the 5th market slot (bore) is up for debate although without it you will likely lose to Totas
hope you enjoy :)
p.s. please don't cast mode 3 sinister rumors