Shield Macro Question

[:1]I want to create a macro for my three primary shield spells and have them set up as

/cast ice barrier
/cast mana shield
/cast mage ward

but i keep having one shield not getting cast (ice barrier will go up and than mage ward and spamming the button from there will just keep saying spell not ready yet even though no mana shield is active) thank you in advance for any insight into this matter
The macro system is designed to not allow macros like this to work. You can use a single /cast command with various modifiers to cast ONE of the three spells depending on what modifier key you're holding down. Alternatively, you can use a /castsequence command to cast Ice Barrier on your first click, Mana Shield on your second and Mage Ward on your third. Macros aren't meant to make decisions based on spell cooldowns.
You can also include a reset timer in your /castsequence command. This will restart the sequence after a set time. This is about the only way you can estimate the behavior you are seeking.