If you could have any video game weapon...

In other words you'd want that card relic. xd
Also, what the hell@that picture? Is that what it looks like after level 50?

Once it gets to level 50 you can use it as an equippable weapon. It's damage is equivalent to it's level, making it one of the three potentially strongest weapons in the game.

And yeah, it changes form after 50, as well.