Your regular combat phase wont untap your creatures, so you need to get through the combat first
Factor in the number of dual lands you could potentially fetch and if it's mainly basic lands, you could likely pull back a fetch or two
Teferi's Protection Many EDH games revolve around surviving massive wrath effects, and Teferi's Protection, Magic's best phasing card, provides that
Yes, but it looks best when you limit the chaos
Long-game card-drawing advantage aside, Kefnet comes down early and, if set up properly, can deter people from attacking you for a good chunk of the game
Nadu, Winged Wisdom $18 People are getting excited to brew around Nadu, Winged Wisdom in Commander, and it's one of the best commanders from Modern Horizons 3