Just like the other two listed before him, Jarad has the ability to get around the commander tax, but it's a little less obvious/consistent, as you have to keep him in your graveyard instead of sending him to the command zone, and then use his ability to return him to your hand.

If you choose not to go the infinite combo route, you can play Tasigur's ability very politically, and play the other players at the table to your advantage to get the cards you want from your graveyard. If you choose to go the combo route, you can generate infinite mana, dump your library into your graveyard, and then put it all into your hand, and because you have infinite mana + your entire library in your hand, it's easy to win from there. He also has access to blue, which gives you fun cards like ], ], ], and loads of counter magic. Like Karador, he can also circumvent the commander tax with dredge. Tasigur can be a very fun and political commander. If you don't want to go with combo, he can easily play as a stax/control general, sculpting the board, graveyards, and hands, and will outlast most decks in a war of attrition (since all of your stuff with just keep coming back). He also can get around the commander tax if you have enough creatures, so he's always cheap to cast! Generally, Karador (along with most dredge generals) is built with combo in mind, the most common being ] + ] + sac outlet to get all of your creatures onto the board, and then comboing from there. Karador focuses on dumping your library into your graveyard (duh) and getting value out of smaller creatures with fun ETB effects to help you control the board.

One of the few dredge commanders with access to white, you get fun things like ], ], ], ], ], and much more.

The best dredge commanders, in my opinion (in no particular order):

Mtg edh dredge