TheWoWDBhttp://www.wowhead.com/?item=29370 155 damage for 20s every 2 mins ~= 25.833 passive damage 43 + 25.833 = +68.833 damage, passive. The Crusade card, for a mage, would almost always be at 10 stacks. This is essentially a passive +80 damage. Any fight of significant length will insure this trinket reaches its potential.
Quest
Darkmoon Blessings Deck
Quest facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
It says "each time you LAND a harmful spell," so I would assume that the initial cast of a DoT would proc it but not the subsequent ticks.
80 spell damage is extremely good for a trinket. It will stack up pretty fast so that's not the problem. But in many fights there are pauses in your dps where it may run out (Gruul, Nightbane, Magtheridon to name a few). This lowers the average effect you get from it.
I don't know whether this will make it useless or not, just pointing it out.
Quest facts
LevelLevel 1-90
CategoryDarkmoon Faire
Quest ID10938
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(10938))
Description
Now that you have gathered all of the Blessings cards together into a deck, a ninth card mysteriously appears with the same backing as the first eight. On this card is inscribed, "Return these cards to the Darkmoon Faire and be rewarded." You have heard that the entrance to this faire appears near Mulgore and Goldshire every month.
Community notes from Wowhead · 59 comments
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ReputationDarkmoon Faire +350
Reward details
Items you receive
TypeArmor Trinket
Item level31
BindingBinds when equipped
EquipAura of the Crusade
EquipAura of the Crusade
Requires level27
Sells to vendors for10 gold
Reputation: Darkmoon Faire +350
A carnival that showcases the weird and the extraordinary, located on a mysterious island only accessible for the first week of every month.
Reputation group: Classic.
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.