Both Sisay and Arcum do exist, and I commented asking Gigi to update the decklinks. The links broke when I changed the deck's names. Here are the updated links:

Arcum: http://tappedout.net/mtg-decks/arcums-asylum-of-stax/

Sisay: http://tappedout.net/mtg-decks/stop-being-such-a-sisay-1/

Teneb: http://tappedout.net/mtg-decks/teneb-midrange-1/

Mizzix: http://tappedout.net/mtg-decks/25-04-16-mizzix-spellslinger/

Hotcake_Gotsyrup, I have my own personal preferences. I prefer commanders that do not involve combos (because they get boring after a while) and provide a fun play experience. However, for competitive games, I often prefer commanders that are predictably powerful for me and are keystones to really powerful spells.

Sorry for the update things, I forgot and they got lost in the comments ;) gonna do that tomorrow :p

Wee_Dragonaut, these tier lists are not based on personal preferences but rather which decks are better than others. Your opinion on Daretti being more powerful than Teferi could be because you've yet to see a refined competitive Teferi deck, he is much much more powerful :) Also mono-blue > mono-red