Luis Castillo is worth a star-caliber shortstop, and more - Red Reporter

Twins Bolster Their Rotation With Tyler Mahle

Could the Reds trade Castillo, Mahle, or Gray today? - Redleg Nation

Reds may seek Astros' top prospects in Luis Castillo trade talks

The Potential Cost of Acquiring Pitching in Trades - Twins Daily - Twins Daily

Analyzing EVERY Prospect Traded at the Deadline, by Tieran Alexander

Luis Castillo looks brilliant - Red Reporter

Luis Castillo: Red pitcher may have best changeup in MLB

Luis Castillo trade grades: Mariners add top rotation target, but at a high prospect price to Reds

Luis Castillo's trade value: Nine proposed deals for the Reds' right-hander - The Athletic