Shifting nidānas in Buddhist scripture signal different possibilities for what it means to embody the time of liberation, in short, buddhahood. This paper provides a close reading of the nidāna of an important, never-before studied Dzogchen Heart Essence (Tib. Snying thig) tantra called Secret Tantra of the Sun: Blazing Luminous Matrix of Samantabhadrī (Tib. Kun tu bzang mo klong gsal…