Well, I have a collection of Holy Cards, the vast majority of which do have prayers on the back, cept I’ve framed most of the nicer ones to display around the house, so I can’t read the prayers from the back of them.
One of my favourite prayers is on the back of a card with the image of the Sacred Heart on the front - you know the one:
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The prayer reads:
"O Sacred Heart of Jesus, filled with infinite love, broken by our ingratitude and pierced by our sins, yet loving us still, accept the consecration we make to thee of all that we are and all that we have.
Take every faculty of our souls and bodies, only day by day draw us nearer and nearer to thy Sacred Heart, and there, as we shall hear the lesson, teach us thy holy way."