Ring of Ma’rûf works a little differently than the Wishes from others sets. Rather than letting you simply put a card into your hand from outside the game, this ability replaces your next draw. If you wouldn’t draw a card during the rest of the turn, the ability won’t have any effect.
The spiritual ancestor of the Wishes from Judgment, the Ring of Ma'rûf was, like most of the cards in Arabian Nights, based on a story told by Shahrazad to her husband to keep from being killed. Ma'rûf, incidentally, was a childhood friend of Ali (from Cairo).