James Evans, Tame Tupou, Andy Lynch, Glenn Morrison and Marcus St Hilaire also scored for Bradford.
Bradford pulled clear after the break through Platt, Jamie Langley and James Evans, before Briers' late consolation.
He collected Paul Deacon's kick to score, despite suspicions of a knock-on and added a second, racing clear after receiving a pass from James Evans.
Returning from a month-long absence through injury, Deacon delivered seven goals, one try, and kicks that led to scores for James Evans and Matt Cook.
Two Simon Finnigan tries along with others by Terry Newton and James Evans put Bradford on top at the break, with Luke Robinson scoring for the Giants.
The home side took a 16-12 half-time lead with tries from Damien Quinn, Adam Peek and David Tangata-Toa, while Ryan Boyle and James Evans scored for Cas.
Phil Bailey scored twice in the first half, with Trent Barrett also going over, as the home side hit back from a first-minute try for James Evans.
With so much riding on the game, Bradford got off to the worst possible start in front of their home crowd after James Evans' try was turned down with the video judge considering it to be offside.
But a high challenge by James on Max Evans gave sub Ruaridh Jackson the penalty to edge the home side in front.
Craig Cathcart, Chris Casement, Shane Duffy, Shane Ferguson, Corry Evans and James Lawrie are the other new boys.
Paul Emerick, Jamie Corsi, Ashley Smith, Phil Dollman, Gareth Maule, Alix Walker, Lewis Evans and James Harris have all signed contract extensions at Rodney Parade.
The absence of both Murray and Bogdanovic is very likely to mean a place in the singles squad for Scotland's Jamie Baker, plus Dan Evans and James Ward.
As the founders of Portrait Salon, Carole Evans and James O Jenkins write in the newspaper-style catalogue that accompanies the show, the idea began as an experiment and was not intended to upset or disrupt the Taylor Wessing, but to allow those whose work did not make the walls of the NPG another outlet.
The British pair hope to play during Saturday's doubles match but will face tough competition from the other members of the squad in Andy Murray, Ross Hutchins, James Ward and youngster Dan Evans.
"You can't sit here and judge and talk about a team winning a championship unless you've done it, " James said, responding to Evans's suggestion in the New York Daily News that the Heat's recent title was tainted by the lockout-shortened season.
"When we're playing at a high level, that's what we're capable of doing, " said James, who acknowledged being annoyed by Evans' comments to the Daily News.
Curiously James makes no appearance in an early biography by Joan Evans, his much younger half-sister.
Already routed twice in Miami this season, the Nets tried to talk tough, Reggie Evans downplaying the Heat's title and James' talent in comments to the Daily News earlier Wednesday.
James Arlidge caught Leinster napping to run in a penalty, Wayne Evans swept in for a fine try and Richard Fussell secured the bonus point on 35 minutes.
Already routed twice in Miami this season, the Nets tried to talk tough, Evans lessening the Heat's title because it came in a lockout season and diminishing James' talent in comments earlier Wednesday.
The Barbarians squad for the upcoming fixture includes Nick Evans and Joe Rokocoko of New Zealand, Dimitri Yachvili and Imanol Harinordoquy of France, James Hook, Duncan Jones and Dwayne Peel of Wales, Sergio Parisse and Mario Castrogiovanni of Italy, Francois Louw of South Africa, and Kahn Fotuali'i of Samoa.
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