What are some powerful blue-black MTG cards that can be used in a control deck strategy?

Some powerful blue-black Magic: The Gathering cards for a control deck strategy include "Counterspell," "Thoughtseize," "Fatal Push," "Cryptic Command," "Snapcaster Mage," and "Jace, the Mind Sculptor." These cards provide strong control elements such as counterspells, hand disruption, removal, and card advantage.