Monster Shark

Whenever Monster Shark attacks, the defending player puts the top quarter of their library, rounded up, into their graveyard.
Along a stretch of coastline somewhere in Florida, a local tourist spot has become plagued by a mysterious marine creature. Unbeknownst to them,
the monster is the product of a secret military experiment; it is a genetic hybrid mutated from a common octopus and the prehistoric
Dunkleosteus.