Adhibhūta is the mutable nature; puruṣa is adhidaiva. And adhiyajña I Myself am in this body, oh best of the embodied!

Adhi-bhūtam: kṣaraḥ bhāvaḥ — transitory, impermanent nature. The world of material elements.

Adhi-daivatam: puruṣaḥ — the transcendent Being, presiding over demigods.

Adhiyajñaḥ aham eva — I Myself am the adhiyajña, atra dehe — in this body. Kṛṣṇa is the Supersoul (paramātman) present in every deha (body).