This thread is getting off track and devolving into another BLU thread i see. I just want to clarify Mighty Guard etc...

Mighty Guard - Base duration 3 Minutes (only accessible with use of a 10 Minute Job Ability), so it is down for 7 minutes before it can be used again.

Cocoon - Costs 1 point (1/60 points total and 1/20 set spells total)

Barrier Tusk - Costs 3 points (3/60 points total and 1/20 set spells total)

Blue Mage has access to about 200 spells, some are locked behind Job Ability use and do not need to be set. The vast majority are not, leaving them only to be able to set 20 of those spells or use 60 points (with Job Points), whichever comes first. Blue Mage has a lot of versatility, but it does have a trade off offense vs defense when setting spells. Whether people want to accept this or not is up to them.

I'm trying to be neutral and unbiased on this. Also, I rarely play Blue Mage, I mainly am on White Mage, Bard, Paladin or Geomancer.