Champion concept for the ink mage

Ok, so I watched the jeremy curios video on the ink mage where you draw to cast spells and i thought about a champion concept I had when yall created GP. I was thinking it would be really cool if instead of having gun powder kegs, he laid down gun powder using his cursor and could ignite it for either an explosion or like a 4 second aoe fire thing. I don't think this EXACTLY would be something useable for the new champ, but it might help to inspire new ideas, like maybe its a wall you create instead, or maybe the enemy cant see it but if they stand in it for 4 seconds they get stunned.

For all I know it's not that new to them anyway and I'm just retarded but oh well.

Take it easy yall,