If a monster is affected by EFFECT_CHANGE_ATTRIBUTE, EFFECT_ADD_ATTRIBUTE won't work.
e.g.: If Mudragon of the Swamp activate its effect and annouce DARK, then activate Armored Xyz with Mudragon targeting, Mudragon won't add attribute equiped by Armored Xyz.
If a monster is affected by
EFFECT_CHANGE_ATTRIBUTE,EFFECT_ADD_ATTRIBUTEwon't work.e.g.: If
Mudragon of the Swampactivate its effect and annouce DARK, then activateArmored XyzwithMudragontargeting,Mudragonwon't add attribute equiped byArmored Xyz.