There are other solid options, such as Skithiryx, the Blight Dragon, that allow you to get around normally high casting costs while hitting the opponent for a ton of infect damage as well
A last thing to note is that since Valki allows you to see all of your opponents' hands, he lets you know when it's "safe" to cast himself as you become aware of whether people have removal in hand
Read More: 10 Amazing Commanders That Cost Less Than A Dollar 3 Mulldrifter You dont have to like Mulldrifter to understand that its a stupidly good card
Paired with cards like Court of Cunning and Mesmeric Orb, you effectively draw the best card among the top 10 or so in your library, which is lovely
His "Don't Just Sit There" ability makes this a truly powerful card, however
Then we got Field of the Dead