Balord said:
So this archmage is not as powerful as I first thought, but still the idea of a fully buffed shapechanging Archmage surrounded by an AMF (one that does not affect him) seems very scary. Or imagine a fighter/wizard/eldritch-knight using the Extraordinary Spell Aim (pointed out by Gabrion earlier in this thread) with AMF. Yikes!
This is not very scary at all.
Say you have a Wizard enclosed in an antimagic bubble. Yes, he can buff himself and prepare for later combat.
But, it is very difficult for him to be effective at all in combat before the Antimagic Field comes down.
He could take a weapon and go up to the enemy fighter and swing and have a good chance of hitting. But, weapon damage plus Str bonus would require a lot of rounds to take out an enemy similar level Fighter this way. If the Fighter is in the Antimagic Field and the Wizard is not, his spells and weapons would still be non-magical when they get to the Fighter.
Even a Polymorphed or Shapechanged Wizard reaching into the Antimagic Field around the Fighter would suddenly have his Troll or Dire Bear or Dragon claws suppressed and he would effectively be making an unarmed attack against the Fighter. Without Improved Unarmed Strike or Monk levels, the Fighter would get a free Attack of Opportunity and if he hits, the Wizards melee attack is nullified.
Plus, unlike a Wall of Force, nothing indicates that you can Teleport through an Antimagic Field. Hence, the enemies of the Wizard can pelt him with magical/aligned arrows (which get magical again once they get to his square) and he can hardly counter-attack or run away (he could conceivably Fly away, but his opponents should often be able to stay with him).
Such a Wizard would be well protected against spell attacks, but he would not be very scary until he dismisses the Antimagic Field.
The best such a Wizard could do to be offensive would be to fire missiles out of his antimagic bubble. An Arcane Archer, for example, with an antimagic bubble around her might conceivably be able to use some of her arrow spell-like or supernatural powers through the bubble.
But, this is hardly a great or scary tactic. It is a spell defensive tactic until the Wizard buffs up, but would be relatively ineffective against missile and melee attacks.