The former Penrith Panther and Wests Tiger was among the tryscorers as the hosts overcame Huddersfield 26-10 at Stade Gilbert Brutus on Friday.
Staines and Ben Condon gave the Dragons the advantage before Sam Halsall replied on the stroke of half-time, but further touchdowns from Tommy Makinson and Solomona Faataape secured an opening-round win, either side of George Flanagan crossing.
The Dragons opened the scoring in the 17th minute when Condon touched down and Toby Sexton added the extras before they nearly extended their advantage, but Faataape's effort was ruled out by the video referee.
Sexton sent the Dragons ahead further with a penalty and Staines burst through a gap to ground for their second try of the evening, with Sexton converting.
Oliver Russell was shown a yellow card for Huddersfield for a professional foul, but the visitors managed to pull one back just before half-time when Halsall broke forward to cross in the corner, but Flanagan was unable to convert.
With a 14-4 lead, Catalans almost struck early in the second half through Sexton, but they soon bagged their third try - 64 minutes in - when Faataape played the ball into Makinson to ground, with Sexton converting.
Flanagan then replied just minutes later for Giants after chasing down Tuimoala Lolohea's kick and went on to score underneath the posts before converting his own try.
However, the French side wrapped up the game with six minutes to play when Faataape burst down the left to ground and Sexton's conversion was successful.
Leigh ran in five tries as they opened their Super League campaign with a 26-14 victory over under-strength Leeds at Leigh Sports Village.
Leeds, who are mentored by former Parramatta coach Brad Arthur, were missing nine players.
Papua New Guinea international Lachlam Lam played a strong hand in the win, scoring a try and throwing a one-handed pass for a try assist.
Leigh coach Adrian Lam told BBC Radio Manchester: "First home game, with a few new faces in our team, so it was important that we won in front of our own fans in a sold-out stadium."
Arthur told BBC Radio Leeds: "I was really happy with our effort, our fight, and thought we had some good periods of physicality, but some detail ... two scrappy tries that you can't afford at this time of the year."
Warrington posted a 24-14 win over St Helens.
A strong first half saw Toby King, Cai Taylor-Wray and ex-Manly Sea Eagle Albert Hopoate run in for the Wire before Jack Welsby and former St George Illawarra Dragon Tristan Sailor replied after the break for the visitors.
But Josh Thewlis' try sealed an opening-round win for Sam Burgess's team, despite ex-North Queensland Cowboy Kyle Feldt's late consolation.