Matias was traded to Rain or Shine Elasto Painters from Burger King, which was renamed to Air21, along with Ronjay Buenafe in exchange for Sol Mercado and Jay-R Reyes, together with the 2011 and 2013 first-round draft picks of Air21.
[1][2] Matias won his first title with Rain or Shine after beating the B-Meg Llamados in the finals of the 2012 PBA Governors' Cup.
[3] Matias just stayed for a while in this team, he is traded again to the San Mig Super Coffee Mixers in exchange for Yancy de Ocampo and Val Acuña for him and Yousef Taha.
[6] After winning his second PBA championship, Matias was traded again for Mick Pennisi with his teammate fellow bigman Isaac Holstein.
[9][10] Matias went controversial in 2013, after a commotion that happened on the Smart Araneta Coliseum during a game with Rain or Shine against the Alaska Aces.