Dagger of Death's Door

You may sacrifice any number of creatures as you
cast this spell, if you do this spell costs {2} less to
cast for each creature sacrificed this way.
Flash
When this equipment enters the battlefield you
may return a creature with mana value 4 or less
form your graveyard to the battlefield attached to
this equipment
Equipped creature gets +2/+0 and gains
deathtouch
Equip {b}