Muramasa Blade

Muramasa Blade can be attached only to a
legendary creature.
Equipped creature gets +1/+1.
Equipped Samurai gets +3/+3.
Creatures dealt combat damage by equipped
creature can't be regenerated.
Equip creature with regenerate — Pay 1 life.
Equip Samurai — Pay 5 life.
Equip — Pay 10 life.