Given the generally low mana-curve in Modern, cards exiled with the pirate monkey will usually be castable with the help of the Treasures and almost any card is worth playing as it simply generates card advantage
For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty
Rydia reanimating Fenrir after it expires on turn five is filthy
Dark Confidant [one_fourth_last stack="responsive"] [/one_fourth_last] Whether or not you think the Modern staple is worth it in Commander kind of doesn't matter, because for our format there's basically a direct upgrade to Bob ready and raring to go
you can even target yourself if you want to set up your own graveyard shenanigans or win with Laboratory Maniac
Aragorn, Company Leader Aragorn, Company Leader can give itself and your other creatures some helpful keyword abilities