IDK... there are still things in the kit and lore that confuse me. Though his abilities seem to be straight forward, there are gaps as to what they do (even without saying the damage). His passive doesn't explain how to collect fireflies, and even if its like Thresh, there is no hint as to a limit or if it is infinite. There is also no hint as to if Sigil uses mana or not. Sigil's kit is also geared more for a Assassin when you compare his kit to other champs... Xerath, Ahri, and Malzahar are Mages with secondaries as Assassin and all use spells at more of a range (yet are also able to assassinate with tons of burst). His kit seems to be almost purely made for assassination... I'm just trying to point this out so that they might change the Primary to Assassin. I understand why (though) they would do this, and it has something to do with his Q.
His Q has a silence, but all other Assassins had their silences removed and only Malzahar as a Mage/Assassin kept his. Giving a silence to someone with this much mobility in their kit is going to be hard to overcome.
This mechanic in general confuses me. If Sigil uses his W to fling his staff to a location and then retracts it, his Q gets a silence if used after getting back his staff? But if he doesn't have the staff, he sends out a pulse? Can you control the direction of the Pulse? It also made me ponder why they would add a ability like his E into this...
His E sends him to his staff, but why can't that be his second us of his W? I'm not going to suggest a new ability, because I might just suggest something worse, but it kind of seems like a waste to have him throw his staff, not be able to attack, and for it to be his main way of doing much.
I will try though... BUT PLEASE DON"T HATE ME!! :'(
His passive could stay as is, as he can gain some sort of bonus magic damage by stacking Fireflies, but instead of losing his basic attacks, losing his staff means all but his W get a silence.
His Q (if he is going to be a Mage) needs to be able to deal damage to multiple enemies... meaning that although he must attack a selected enemy, his two slashes deal damage to those behind the target enemy. To be frank, Sigil deals two basic attacks real fast and deals bonus magic damage by sending out shockwaves past the target. If Sigil retrieves his staff, this ability will gain a silence for the next 2 seconds.
His W will have Sigil throw his staff to a select location dealing some damage and giving vision for a few seconds. If a enemy is able to break his staff, he must wait out a second before he gains another. Sigil has two other options from here: Sigil can either draw the staff back to himself (which will enhance his Q) or go to the staff to knock up enemies for 0.5 seconds. Both deal respective damage.
Sigil's E will be his Pulse (which will have two charges). Each burst of Pulse deals damage and knocks a enemy back (but no stuns).
Lastly, his R will still have Sigil ride on his staff gaining bonus MS based on the level and gives a boost to one of his abilities during that time.
His Q now sends out 3 hits; his attack damage per hit is lowered to 80%.
His W sends out a small whirlwind (that goes a short distance) with his staff in it. Sigil can then do as he would normally with his W allowed.
His E boosts his speed (up to 3 tries) for him to hit a champion and deal damage. The enemy is knocked back.
I'm sorry...