That reading is given in the Revised Version thus: -- 'And they sing a new song, saying, Worthy art Thou to take the book, and to open the seals thereof; for Thou wast slain and dist purchase unto God men* of every tribe, and tongue, and people, and nation, and madest them** to be unto our God a kingdom^ and priests: and they reign^^ upon the earth.'
* The word ηµας (heemas), "us," goes out, with the authority of Lachmann, Tischendorf, Alford, Westcott and Hort, the Revisers, and the Codex A. It is true that the authorities are divided as to this word, but as they are unanimous as to the other changes in the verse, this word necessarily must go out as the result.
** The word ηµας (heemas), "us," must be changed for αυτους (autous), "them," with all the critical authorities.
9 and they sung a new song saying: thou art worthy to take the book, and to open the seals thereof, for thou wast killed, and hast redeemed us by thy blood, out of all kindreds, and tongues, and people, and nations, 10and hast made us unto our God, kings and priests and we shall reign on the earth. Tyndale New Testament
And they sung a {b} new {11} song, saying, {12} Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation; Geneva Study Bible
9And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation; 10And hast made us unto our God kings and priests: and we shall reign on the earth. Strong's KJV
I am seeing 'us' in these versions. I'll take the collected wisdom of these writers over you Bull inger.