Holy Infant of Prague (AKA The Little King) Prayer/Holy card.

On the back is the miracle prayer by Our Lady given to The Venerable Father Cyril OCD:

O Child Jesus, I have recourse to You through Your Holy Mother;
I implore You to assist me in this necessity, for I firmly believe that Your Divinity can assist me.
I confidently hope to obtain Your holy grace. I love You with my whole heart and my whole soul.
I am heartily sorry for my sins, and entreat You, O good Jesus, to give me strength to overcome them.
I am firmly resolved never to offend You again and to suffer everything rather than displease You. Henceforth, I wish to serve You faithfully. For love of You, O divine Child, I will love my neighbor as myself. O Jesus, omnipotent Child, I entreat You again to come to my assistance in this necessity. [Mention it here].
Grant me the grace of possessing You eternally with Mary and Joseph and of adoring You with Your Holy Angels and Saints.
Amen.