The Last Word is a relic weapon card.
How to Get
|•||On Play:||"One bullet should do."|
The Last Word is fantastic with a board clear, as Lightning Storm deals severe damage, while Harsh Rule or Leave a Witness can completely turn the game around and prepare for a win condition. Even without having 18 power, as long as you have board presence it would be difficult for the opponent to remove the The Last Word without direct spells. In the late game, this relic weapon can turn games around, especially in stalemate situations.
The skills on relic weapons are applied to spells you play. Since this has Deadly, if you were to play Lightning Storm, the 2 damage dealt by it would also be Deadly. However, per the card text, the "deadly to players" effect only applies to attacks, not spells.
There is a hidden achievement for killing a player with The Last Word.