From what I could find, the Grand Prix cards are about 26x36 foam boards and are available in different languages
Primeval Titan's ability to search up any land, not just basic lands, from your library and place them directly onto the battlefield allows it to find powerful land effects like Hanweir Battlements, Sunhome, Fortress of the Legion, and Valakut, the Molten Pinnacle
That activated ability can be absolutely criminal, whether you use it to finish someone off or just to bring them down a peg
OR you could just make the exact token you need
It even shares the mana value of Gravedigger, so I get why this card costs this much, even if I would never build around it
Greven, Predator Captain might seem like an odd choice, but theyre incredible with Rat Colony in particular