Finished Work; Finished Word

I’ve been on the look out for parallels between the Lord’s Supper and the Scriptures. Perhaps one is evident in comparing the Roman Catholic and Reformed accounts of the Work and Word of Christ.

For the RC, the saving Work of Christ continues in the Church's sacrifice of the mass and his Word continues to be mediated to the Church by the living voice of tradition, aided by the Spirit.

For the Reformed, the saving Work of Christ is finished on the cross and so is his Word in Scripture.

Maybe there's also something to explore around the fact that as Roman Catholics add to the two dominical sacraments, so also they add to the supreme authority of Scripture, the supreme authority of the teaching office of the church?