10 cards where the cards have the “grandprix” watermark

Call of the Herd (Grand Prix Promos #2008)
Chrome Mox (Grand Prix Promos #2009)
Forest (Grand Prix Promos #2018f)
Island (Grand Prix Promos #2018b)
Maelstrom Pulse (Grand Prix Promos #2011)
Mountain (Grand Prix Promos #2018d)
Plains (Grand Prix Promos #2018a)
Spiritmonger (Grand Prix Promos #2007)
Swamp (Grand Prix Promos #2018c)
Umezawa's Jitte (Grand Prix Promos #2010)

This search is finished. Now the real work can begin.