Why? Shouldn't it be His Resurrection? My reading from Christ the Ideal of the Priest has provided a neat insight.
We must realize that, at the consecration, the whole drama of Calvary, with all the consequence of sufferings and humiliations which it involved for Jesus, is present before God. It may be said in all truth truth that we are displaying before the eyes of the Eternal One all this divine past; that is why the Apostle says so aptly that at every Mass "we announce to the Father the death of His Son."We really do need to try to acquire a "God's eye view" of the Mass.
Every time that a priest celebrates Mass, he is presenting (to the Father) the Son Himself under the sacred species making, for love, a true immolation, though in sacramental form.
Let us dwell a little on this thought. What does the Father see on the altar stone on which the holy sacrifice is offered? He sees the body and blood of the Son of His love: Filius dilectionis suae (Col. 1:13). And what is that the Son is doing on the altar? Anuntiat mortem: He is placing before the eyes of the Father His love, His obedience, His suffering, the oblation of His life. And the Father casts on us a look of mercy.