That said, the words "Pray for us" are usually part of the prayer; and when they are not explicit, they are nevertheless understood. Nobody thinks that the saints in heaven act as independent agents, dispensing favors by their own power or piety, apart from Christ Our Lord.
Notice HERE (Link), the the classic Litany of the Saints, the difference between how the Saints are addressed, and how Our Lord is addressed.
The Lord is asked to have mercy on us and save us.
And you'll notice (tagline) the angels, too, intercede, by offering our prayers to God.
uhhh...the catholic forgets, or rather, wants to forget the false rcc teachings on Mary...
The union between the Immaculata and the Holy Spirit is so inexpressible, yet so perfect, that the Holy Spirit acts only by the Most Blessed Virgin, his Spouse. This is why she is the mediatrix of all graces given by the Holy Spirit. And since every grace is a gift of God the Father through the Son and by the Holy Spirit, it follows that there is no grace which Mary cannot dispose of as her own, which is not given to her for this purpose." — Manteau-Bonamy, Immaculate Conception, 91; F.X. Durrwell, The Holy Spirit of God (Cincinnati: Servant Books, 2006), 183-185
Sheer. utter. BLASPHEMY. The one above alone would make me run from the roman catholic cult.
According to Eadmer (A.D. 1060–1124), an English monk and student of Anselm, “sometimes salvation is quicker if we remember Mary's name than if we invoked the name of the Lord Jesus...[who] does not at once, answer anyone who invokes him, but only does so after just judgment. But if the name of his mother Mary is invoked, her merits intercede so that he is answered even if the merits of him who invoked her do not deserve it.” Through her “the elements are renewed, the netherworld is healed, the demons are trodden underfoot, men are saved and angels are restored.” — Andrew Taylor, “Three medieval manuscripts and their readers,” University of Pennsylvania press; page 173
>In "Glories of Mary" by Liguori, whose writings were declared free from anything meriting censure by Pope Gregory XVI (1839) in the bull of his canonization, he teaches, Beware, chosen soul, of thinking that it is more perfect to direct your work and intention straight to Jesus or straight to God. Without Mary, your work and your intention will be of little value. But if you go to God through Mary, your work will become Mary's work, and consequently will be most noble and most worthy of God. - THE SECRET OF MARY, St. Louis de Montfort; http://www.ewtn.com/library/Montfort/SECRET.HTM
Richard of St. Laurence encourages sinners to have recourse to this great name, "because it alone will suffice to cure them of all their evils;" and "there is no disorder, however malignant, that does not immediately yield to the power of the name of Mary." — St. Alphonsus de Liguori http://www.doctorsofthecatholicchurch.com/AL.html
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And you know there's a lot more of these false teachings on Mary as espoused by the rcc.