Example Final Board
You want to play this if you hit Bard Headliner. You preferably want the +1 Jazz version but this also works with the Dazzler version.
Our goal is to get bard to cast as much as possible because when Bardis your headliner he gets the following effect on his spell:
Headliner Effect: The finale of Bard's first cast each combat spreads an additional Doot for every 8 times he's cast this game. Doots deal 95/140/215 (Ability power) magic damage.
Rageblade and Shojin allow us to cast as much as we can each combat and Archangels staff means our damage will scale throughout the fight too.
Having the Disco trait in with Gragas as our main tank allows us to stall out the round allowing for bard to get as many casts as possible so he can scale.
You want to slow roll at lvl 6 for as many bards and gragas as possible. You can substitute Taric for Blitzcrank if you don't hit an early one.