The entire Mass must be taken into context, though. Many prayers by themselves could have all sorts of things "read into" them, including those from the Byzantine liturgy. Here are a few explicit examples from the Mass of St. Tikhon:
And we most humbly beseech thee, O merciful Father, to hear us; and of thy almighty goodness, vouchsafe to send down thy holy Spirit upon these thy gifts and creatures of bread and wine, that they may be changed into the Body and Blood of thy most dearly beloved Son. Grant that we, receiving them according to thy Son our Saviour Jesus Christ's holy institution, in remembrance of his death and passion, may be partakers of his most blessed Body and Blood.
...humbly beseeching thee, that we, and all others who shall be partakers of this Holy Communion, may worthily receive the most precious Body and Blood of thy Son Jesus Christ, be filled with thy grace and heavenly benediction, and made one body with him, that he may dwell in us, and we in him.
...deliver me by thy most sacred Body and Blood from all mine iniquities.
Grant us therefore, gracious Lord, so to eat the flesh of thy dear Son Jesus Christ, and to drink his blood in these Holy Mysteries, that our sinful bodies may be made clean by his body, and our souls washed through his most precious blood, and that we may evermore dwell in him, and he in us. Amen.
Almighty and ever living God, we most heartily thank thee, for that thou dost vouchsafe to feed us who have duly received these holy mysteries, with the spiritual food of the most precious Body and Blood of thy Son our Saviour Jesus Christ; and dost assure us thereby of thy favor and goodness towards us; and that we are very members incorporate in the mystical body of thy Son, which is the blessed company of all faithful people; and are also heirs through hope of thy everlasting kingdom.
These prayers are just as explicit as, "And I believe that this is truly thine own immaculate Body, and that this is truly thine own precious Blood." I also love their portrayal of the intimate connection between the holy mysteries and theosis.