It's all change in the front row as Coundley, Gustafson and Way return to the squad. Buck and Parry move to the bench whilst loosehead Phil Price is scheduled for knee surgery on Tuesday.
Dragons team for Scarlets
Tom Prydie, Will Harries, Pat Leach, Jack Dixon, Ross Wardle, Dan Evans, Jonathan Evans; Aaron Coundley, Hugh Gustafson, Dan Way, Andrew Coombs (c), Rob Sidoli, Dan Lydiate, Nic Cudd, Toby Faletau.
Replacements:
Sam Parry, Owen Evans, Nathan Buck, Jevon Groves, Ieuan Jones, Wayne Evans, Steffan Jones, Adam Hughes.
Tickets are available from WRU Store. On matchday they can be bought at Cardiff Blues ticket office.
Judgement Day brings Newport Gwent Dragons v Scarlets and Cardiff Blues v Ospreys in the RaboDirect PRO12 to the Millennium Stadium on Saturday 30th March.
The back-to-back RaboDirect PRO12 games will be played as part of a four-year deal which brings the two East Wales regions to the Millennium Stadium to take on the two West Wales sides on rotation each season.
For the inaugural battle, tickets are available now at £10 for children and £25 for adults. A family package (2 adults, 2 children) is also available priced at £50