Allosaurus

Banding, Flanking
{t}: Search your library for an Allosaurus or green creature card with power 4 or greater, reveal it, put it into your hand, then shuffle your library.
It has been speculated since the 1970s that Allosaurus preyed on sauropods and other large dinosaurs by hunting in groups. Such a depiction is common in semitechnical and popular dinosaur literature.