Breaching Hippocampus

Islandwalk
Whenever you cast Breaching Hippocampus, target land loses all abilities and gains "{t}: Add {u} to your mana pool." for as long as you control Breaching Hippocampus.
Whenever Breaching Hippocampus is placed in a graveyard from play, target player puts the top three cards of his or her library into into his or her graveyard.