Idea for an ammo-based champion

So I've been kicking around this vague idea for a champion I think would be cool. Basically, the character is a mobile arms factory of some sort or maybe a Yordle-sized Bob-omb. This character comes with a high base movespeed and weak scaling over time (maybe make that its passive). It has an ability that stacks "Ordinance" which is used for its other abilities. Every stack of Ordinance it gets slows it down and its sprite gets larger (increasing its range), such that around 20-30 stacks where it really gains high burst potential, it's moving a little slower than most characters.

One ability I had in mind that plays with this is the character packing some (maybe a third) of its current ordinance and throwing it. The stacks are removed from it while in the air and it gets lighter and smaller (reducing size, increasing movespeed). If it catches the ordinance, the stacks are put back on. If it misses, the ordinance hits the ground and explodes dealing damage.

Another ability has it just quickly venting half its Ordinance for a cone-shaped nuke In front of it. This takes advantage of its size and benefits from high Ordinance.

Another passive I had in mind that could actually be an ability is a shield around it that consumes so many of its stacks per point of damage that it suffers. For instance, an auto attack might consume 2 stacks, but a crit might consume 8. It grows exponentially so that it's not just shrugging off huge hits cheaply and it's not losing all its Ordinance to a series of weak auto-attacks.

A cool dash might be charging up (letting the player pick how many stacks are consumed) and dashing a certain distance and leaving a damage area in its wake.

Another cool idea could be just eating Ordinance and healing for a fixed amount per stack.

There are a lot of cool things you can do with this base idea, and I'd like to see it come to fruition. Naturally all of its abilities would need base damage so they're not useless without stacks, but ideally the player has to actively gather, save, and expend Ordinance judiciously. It seems like a thinking-man's bruiser or mage.