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A host of good MLB starting pitchers are "potentially available" via trade, per Mark Feinsand of MLB.com.
"According to sources, those pitchers potentially available include Seattle's Luis Castillo, Miami's Jesús Luzardo, San Diego's Dylan Cease, Houston's Framber Valdez and St. Louis' Sonny Gray," Feinsand wrote. "Of that group, Gray is the only one with a full no-trade clause in his contract."
Of course, that's in addition to solid arms already available via free agency, including Corbin Burnes, Max Fried and Jack Flaherty.
This article will be updated soon to provide more information and analysis.