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Because Ziggs' Mega Inferno Bomb has a different delay depending on the distance of the target, I propose a slightly easier way to aim.
When the user is choosing the target location an arch of is shown from Ziggs to the target location as the pathway of the bomb. On the arch, there is a 0.5second increments to show the time it takes for the bomb to reach the location. This helps with approximating how long it takes for the bomb to reach the target after being thrown.
It's hard to explain, but I think it would help a lot, and cosmetically look nice as well to make it stand out from a somewhat bland-looking ulti.