Frostmourne

Equipped creature gets +2/+2 and has
protection from blue and from black.
Whenever equipped creature deals combat
damage to a player, surveil 2. Then you may cast
an instant or sorcery spell with mana value 2 or
less from your graveyard without paying its mana
cost. If that spell would be put into your
graveyard, exile it instead.
Equip {2} Sword of Once and Future