The benefit of this is that it works well with both the face commander and the alternative commander, Hashaton, Scarab's Fist
Its important not to stuff your deck with cards youre not likely to play, like unnecessary planeswalkers or battles , but as many usable types as you can justify is a good idea
This makes your rat army very hard to defend against
(Prevent all damage that would be dealt to attacking creatures with hope.)
If your TCG isnt on this list, consider if any of the following are true: 1) Your game has more than two different card backs for different cards or decks, and so is not worth my time
Like Ugin, Karn is typically a little better suited to the more controlling ramp decks as it takes so long to get loads of value from them