From Hidden Arsenal 4 back cover:
Jurrac monsters are a special kind of Dinoasaur. What makes them special? They're on FIRE, that's what! These kinds of Dinos weren't wiped out by meteors. They BECAME meteors! You can make your opponent's cards extinct by Summoning "Jurrac Meteor." As soon as it falls out of the sky and onto the field, every card gets destroyed! Then when the dust clears, you can Summon 1 Tuner from the Graveyard, so you'll have the only monster in play.
You can find lots of other Jurrac Dinosaurs in this set, too!