The best game actions you can take in Commander are ramping and drawing cards, so commanders that do either or both rank highly
When Icingdeath, Frost Tyrant dies, create Icingdeath, Frost Tongue, a legendary white Equipment artifact token with "Equipped creature gets +2/+0," "Whenever equipped creature attacks, tap target creature defending player controls," and equip
Knowing that we were going to be on Innistrad for two sets, we wanted to make sure that the hope and whimsy themes that have always been a small part of Innistrad had a larger footprint
Pairing Fetches with Your Dual-Type Lands The rule of thumb is to run at least two or three fetchable targets per color pair you care about
Its a free sacrifice outlet in decks like aristocrats, and it can proliferate, draw a bunch of cards, and remove small creatures all by itself
Yawgmoth is probably in the market for 2 copies and Phyrexian Tower will provide a boost to any creature sacrifice shenanigans in modern in the future