A system has been added that will automatically add divination cards and other items to the item acquisition sections where appropriate. Entries added by this system will be shown as automatic in the item acquisition section.
Some pages will need to be updated to include
upgraded_from_disabled=true if they are not eligible for the system.
Some further details on what needs to be done can be found on Path of Exile Wiki:To-do list/Automatic upgraded from and issues can be posted on the talk page.
Mastermind of Discord
25% increased Effect of Heralds on you
Damage penetrates 25% Fire Resistance while affected by Herald of Ash
Damage penetrates 25% Cold Resistance while affected by Herald of Ice
Damage penetrates 25% Lightning Resistance while affected by Herald of Thunder 
Mastermind of Discord is a notable Ascendancy passive skill for the Elementalist that grants elemental penetration based on the element you have a Herald skill active for. It also grants Heralds increased effect and reduced mana reservation.