What can I do with my remaining Mystical Cogs after crafting minis?
Solution 1:
For one day, there was a bug where mystic cogs suffered from Dungeon Diminishing Returns. I.e., if you completed another dungeon, then ran Tixx's dungeon, you would get less than 200 mystic cogs.
As far as I'm aware, this was Anet's 'fix' for those adversely affected, so that everyone has enough mystic cogs to make exactly 2 minis, as 200 extra cogs is not enough for someone not affected by the bug to get another one.
To the best of my knowledge, there is no other use for the mystic cogs --- at least, this year!