Most Powerfull Saints?

do we have any OO saints who's intercession is extremely powerful?for example the Roman Catholics have Padre Pio who's intercession is responsible for many miracles still we have any Saints of such or better calibre?I know Saint Abba shenouda the Archimandrite's intercession is very powerfull and also Saint Minas,do we have any that have appeared to people in  dreams or made apparitions?
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