Didn't tweak the design from what was posted, since I've been busy this weekend, but still open to more feedback. Anyways, went with a pretty vanilla card just to illustrate the mechanic, not something cool that makes better use of it.
Daij_Djan: actually the token is colorless on purpose (to mirror the artifacts and to save reminder space), but I thought the white frame looks better than the colorless frame! May be bit confusing though.
sdfkjgh I looked to see if there were any cards that enchant players that aren't Curses. Turns out, there are two (three if you count silver border.) Personally, I opted not to make it a Curse, because it doesn't really negatively impact the enchanted player, explicitly, whereas every other Curse at the very least incentivizes attacking that player. While this card could be used in a game to target a powerful opponent and steal some of their effectiveness, it could also be used in a game like Commander to work together to take down a larger threat, or in 2HG to gain more access to your teammate's boardstate.
TL;DR It didn't seem like an explicitly negative effect for the targeted player, and there's precedence for non-Curse player enchantments, so that's what I went with
Signature spells (not those ones (or those ones (or those ones))) can only be cast while you control a creature with the same name as the corresponding creature. Here, you can cast Hallar, the Twinfire at any time, but you can only cast Kavu Assault while you control a creature named Hallar, the Twinfire. Signature spells appear exclusively on legendary creatures.
Jartis : This feels so much like a Curse. Is there any reason why it isn't?
jarribas309 : The way cremate is worded, it sounds like you're missing an "instead" at the end. Was this intentional? One of the main selling points to exiling is that is doesn't trigger abilities that look for something dying, so I would think that that's what you were going for.
Yes, it was, correction is needed.
Do you ever feel like procrastination is your brain's way of stopping you from making a mistake?