Spark Master Tape is an anonymous internet rapper known for his unique aesthetic and sound, which is partially thanks to his producer Paper Platoon (likely Spark himself) and his artificially deep voice. As put by a writer on the website MishkaNYC, he "somehow manages to have enough bump and 808s to satisfy y'all that think Juicy J is God and enough verbal dexterity to have everyone that misses the old days of rappity rapping."
There's really nothing quite like him, I'd recommend his music. Check him out at https://soundcloud.com/sparkmastertape. His Soundcloud has his loose tracks and streaming for all of his mixtapes available.
Downloads for his four mixtapes can be found here:
The #SWOUP Serengeti
Silhouette of a Sunkken City
The Lost Grapes EP
Playlist of his loose tracks: https://soundcloud.com/mrsirshpee/sets/spark-master-tape-loose-tracks