Stygian Blade

Equipped creature gets +3/+2
Whenever equipped creature deals combat damage to a player, draw a card, then you may cast a spell from your hand with mana value less than or equal to that damage without paying its mana cost.

Equip {2}
Stygius, the Blade of the Underworld, must have been among the finest weapons ever wielded, back when it was whole. Back when the six elder gods sealed the Titans in the deepest recesses of Tartarus, that blade evidently played no small role in their success.