There was once an epiklesis of the Logos. Also an epiklesis of the Trinity.
I read that the Roman Liturgy had an epiklesis following the words of institution until being revised by Gregory the Great. Also that Augustine and Ambrose were to a great extent responsible for changing emphasis from the epiklesis to the words of institution. Also that epiklesis was a pagan practice in ancient times. (The new Schaff-Herzog encyclopedia of religious knowledge, p. 153)
Cyril of Jerusalem wrote: “Before the invocation of the adorable Trinity, the bread and wine of the Eucharist are merely bread and wine; but after it, they are the body and blood of Christ.” (Catecheses mystagogicae 1, 7.)