P.E.I. was the last piece of the 14-team puzzle for the Tim Hortons Brier in Calgary from Feb. 28 to March 8.
Casey edged Jamie Newson 7-6 in an extra end in the provincial men's final in Alberton.
Casey has previous Brier experience, but not as a skip. He played second in each of the last three national championships for Brad Gushue from Newfoundland and Labrador.
Gushue, a former Olympic champion, reigning Olympic champion Brad Jacobs of Northern Ontario, national and world champion Kevin Koe from Alberta, former Canadian and world silver medallist Jean-Michel Menard from Quebec as well as the defending champions skipped by John Morris headline this year's Brier field.
A central plot to this year's tournament is Koe, who will face three-quarters of the team he skipped to victory at last year's Brier in Kamloops, B.C.
The Calgarian left the team to form a new one with Marc Kennedy, Brent Laing and Ben Hebert in the off-season.
His former teammates Pat Simmons, Carter Rycroft and Nolan Thiessen recruited Morris to skip the first Team Canada entry in Brier history.
The format was altered this year to mirror the women's championship, the Scotties Tournament of Hearts, which has had a Team Canada in the field for years.
Morris, also from Calgary, won a national and world championship as well as Olympic gold in 2010 playing third for Kevin Martin.
Rounding out the field is Jim Cotter (B.C.), Steven Laycock (Saskatchewan), Bob Smallwood (Yukon), Jamie Koe (Northwest Territories), Reid Carruthers (Manitoba), Mark Kean (Ontario), Glen MacLeod (Nova Scotia) and Jeremy Mallais (New Brunswick).
Another alteration to the national championship format will be a play-in round involving Nova Scotia, Prince Edward Island and Yukon for the right to enter the 12-team main draw. Nunavut didn't enter a team.
The Brier winner will represent Canada at the Ford World Men's Championship from March 28 to April 5 in Halifax.