D&D 5E Draconic Resilience & Mage Armor

[Charlaquin]

which means its more relevant to the current rules, no?

No, for the reason Marric mentioned in response to you; D&D Beyond has to do some odd things to make the rules function correctly within their digital toolset. But the rule book is very clear that if you have multiple abilities that give you ways to calculate your AC, you can only use one of them.

 

[MerricB]

D&D Beyond is not capable of making Mage Armour affect your AC when you cast it. It is not a way to win this argument.

Also, Sage Advice: (Sage Advice Compendium | Dungeons & Dragons)

 

[Lycan]

D&D Beyond is not capable of making Mage Armour affect your AC when you cast it. It is not a way to win this argument.

Also, Sage Advice: (Sage Advice Compendium | Dungeons & Dragons)

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if you take that every word for every word then you also wouldn't be able to use the shield spell which adds a AC calculation of +5, so they very much so contradict themselves there.

 

[Charlaquin]

if you take that every word for every word then you also wouldn't be able to use the shield spell which adds a AC calculation of +5, so they very much so contradict themselves there.

Shield adds 5 to your AC, it does not give you a new way to calculate your AC.

 

[MerricB]

if you take that every word for every word then you also wouldn't be able to use the shield spell which adds a AC calculation of +5, so they very much so contradict themselves there.

Go to the Sage Compendium I linked to before.

Go to page 2, where it describes how to calculate AC. and the difference between calculations and bonuses.