Originative

(a.) Having power, or tending, to originate, or bring into existence; originating.

Thesaurus Entries

behind the scenes, causal, causative, conceptive, conceptual, constitutive, constructive, creative, decisive, demiurgic, determinative, effectual, esemplastic, etiological, fecund, fertile, formative, generative, germinal, ideational, ideative, imaginative, ingenious, innovational, innovative, inspired, institutive, inventive, notional, occasional, original, pivotal, pregnant, productive, prolific, seminal, shaping, teeming, visioned