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I love what you've come up with here.The idea of limiting active artifacts is something that appeals to a number of the playtester group.
I have a few other ideas with a higher priority for me for my custom card, but I wouldn't be at all surprised to see something like this in the future.
While I think restricting the number of artifacts is a cool idea, I don't think you can put an ability in the identifier. Otherwise, very interesting ideas, but maybe slightly too powerful. I really like the idea of adding brigades to sites.
I like the idea behind the restrict, but I don't think it works correctly every time. If someone already has more than 1 artifact active the restrict doesn't inherently force them to deactivate the extras, they just can't activate more. I.e.: I get Lampstand in a temple, Charms on a magician, something on my pile, and then I activate a Mask on a character. I have 4 artifacts that stay up until if/when they are used/discarded/deactivated.For Self-Glorification, do you intend to mean that you'd get to draw instead of the other player or just that the owner of the ability causing the draw changes (for cards that look at that like Abom or Priest of Zeus)?
To be clearer you could reword Self-Glorification to something like:"and if an opponent uses a draw ability on an Enhancement, Artifact, or Fortress you draw that many instead."I don't think there's an elegant/easy way to word what you want as far as the restrict. You'd have to have something in the ability along the lines of "On activation, each player must deactivate all but 1 Artifact." and that plus the restrict would accomplish what you want. It would make the ability longer but is the shortest way I can think of to accomplish what you're going for.
just a suggestion, for mask of arrogance you should pick one of the other special ability, even if that means instead rad of underselling them you can discard all cards in battle or something like that
Whoops grammar! And spell check! Basically for mask of arrogance you should pick one special ability not you can do this or that. Maybe instead of underdecking say discard all cards in battle and drop the other special abilityIt says On activation, each player must deactivate all but 1 Artifact. While active in your Artifact pile, negate Characters. While active on a Character, protect that Character from conversion, and if that Character blocks, you may play the next Enhancement or remove this card from the game to skip your next rescue attempt and underdeck all cards in battle.I would pick one special ability to do, not both