That activated ability can be absolutely criminal, whether you use it to finish someone off or just to bring them down a peg
Beyond that go for faster lands Sanctum of Ugin, Ancient Tomb, Eye of Ugin, better ramp Mana Crypt, The One Ring for draw, the Eldrazi Titans (all), Conduit of Ruin, Void Winnower, Portal to Phyrexia, okay I'll stop now
If you're photographing physical artwork or a card alter, shoot in natural light with your phone's highest resolution camera setting and avoid flash, which tends to wash out colors and create glare that prints poorly
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
Since cEDH tends to be the environment that finds homes for every form of efficient mana acceleration imaginable, Blood Pet is just going to be more valuable in decks tuned for that part of the Commander format than elsewhere