On paper, Sierra Dawn-Thomas seemed to have Lady Luck in her corner, rooting for her and cheering her on throughout this unpredictable “Game Changers” season.

During her first “Survivor” season, she mainly stayed under the radar, staying loyal to the Blue Collar tribe in a quiet strategy that carried her through to the final five. When it came time to cast “Game Changers”, she wound up becoming a last-minute replacement for “Survivor San Juan del Sur” winner Natalie Anderson.

This made her something of a “Survivor” enigma, to fans and her fellow castaways, who wondered what she would do this season. As it turned out, she became a behind-the-scenes puppet master, calling the shots and devising strategy from the comfort of her hammock — heck, she was one of the chief decision-makers behind voting out Malcolm Freberg at the two-tribe Tribal Council.

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Meanwhile, on her first day on the island she discovered the mysterious Legacy Advantage — which turned out to be one of the main reasons she found herself woefully watching Jeff Probst snuff her torch at Tribal Council after she was blindsided/backstabbed by apparent ally Sarah in a surprise betrayal she never saw coming.

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In this week’s edition of ET Canada’s Post Tribal podcast, Erin Cebula and Parvati Shallow chat with Sierra about what went down at Tribal Council.

The whole thing, she tells Erin and Parv, felt like “I introduced one of my best friends to my boyfriend and caught them cheating.”

Looking back, she admits she was “so mad at myself” for telling Sarah about the Legacy Advantage. “I just made a big mistake,” she says.

You can hear her reveal a whole lot more in this week’s Post Tribal podcast, right here:

Survivor: Game Changers” airs Wednesdays at 8 p.m. ET/PT on Global; you can also watch full episodes online.