Using blessing in this order will only apply 2 blessing.

Buffs used were(in that order):
Misfortune, Reduced Cost + Movement Speed + Warp Resist
Death Augury, Reduced Cost + CD Reduction + Power effectiveness
Fiery Form, Movement Speed + Power effectiveness + Reduced Cost

In above example, Misfortune will be ignored.
Casted slowly with 5 second interval between each casting.(measured with Biometric haste)

Death Augury -> Misfortune -> Fiery Form will maintain all 3 buffs.