Helm of Grixis

Whenever Helm of Grixis becomes equipped, target player puts the top {8}
cards of his or her library into his or her graveyard.
Equip creature
Equipped creature gets +2/+4
Whenever equipped creature attacks, target player puts the top {x} cards of his or her library into his or her graveyard, where {x} is this creatures toughness.
Equip:{2}