Rather than this turning into a flame war lets look at what Bryan said.
Thanks for the compliment!
This is a really good question!
Okay, here is how this is resolved:
Casting a spell has 3 steps:
1) Cast Spell
2) Counter Spell
3) Resolve Spell
When Seeking Dispel is cast, as part of Step 1 it prevents the target enchantment from revealing.
When Step 2 is reached, the Jinx has already been locked down and cannot be revealed.
So, the Jinx is destroyed without being revealed.
The wording on these 2 spells conflict each other, because Jinx says "must". In cases like this where 2 equal events happen which conflict, we first default to the time sequence for resolution. In which case we default to the first event that occurred - the Seeking Dispel preventing the revealing.
In Mage Wars, everything happens in order, in sequence, and whenever possible we resolve conflicts in sequence, with later events not being able to change prior events.
In rare cases, when using time sequence does not work, we default to the Initiative order, and let the player with initiative decide (that makes it easy and fullproof! )
Hope this helps!
So lets brake it down.
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Step 1: Cast SpellAnnounce that you are casting a spell and what the target will be.
You may only choose a target that matches the target requirements listed in the casting line.
Some spells will target a zone on the game board. Other spells will target
a single object.
Pay the cost(s) of the spell
Step 2: Counter SpellOnce the spell has been cast, your opponent has a chance to “counter” it. Normally, there is nothing your opponent can do, and the spell simply takes effect.
However, some spells and abilities, such as the Nullify enchantment, may allow him to counter your spell.
When a spell is countered it is discarded without effect, and you lose the mana spent and any action used to cast the spell (unless the spell or ability which counters says otherwise).
Step 3: Resolve SpellAt this point, the spell takes effect.
The spell type (e.g., conjuration) and the text on the spell card determine the effects of the spell. If you have cast an attack spell, you must now resolve the attack.
When a spell resolves, if you find that the target of the spell is no longer valid (has moved or changed), then the spell is countered.
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The trick is Seeking Dispel has text that applies on cast other text that applies on resolution. Jinx applies the "Must" reveal after the spell is cast. So Seeking Dispels "can not be revealed" text is already in effect.
I hope this helps