Leblanc's R (Mimic) Has No Mana Cost

With all the talk about Ekko's ult having no mana cost, with the main argument being that Ekko does have significant burst and therefore needs a mana cost on his most powerful ability, somehow no one seems to notice that **Leblanc, having one of the highest bursts in the game, has 0 mana cost on her ultimate as well. **

It's said that her ultimate doesn't have as great of an impact as other ultimates in the game, such as Oriana's Shockwave or Ziggs's Mega Inferno Bomb, but saying it's not a significant power spike is just ignorant. Not only does it increase her damage, which adds on to her burst and waveclear, it also makes her even safer and essentially impossible to catch.

So, with the amount of usefulness her ultimate provides, how can it have no mana cost? It basically gives her a free ability that deals more damage than all her original abilities with almost no real punishment for using it, considering how low the cooldown on it is.

Here's a small list of things that can be added to Leblanc as potential counterplay to her kit by adding a mana cost to her ultimate:

• She will have to manage her abilities and mana more conservatively, as now she can't instantly clear waves with double Distortion for mana cost of only one Distortion.

• As a possible result of the previous example, she will be less likely to go in for a safe and secure kill as soon as she hits level 6, since she may be oom from previous trades.

• When she is low on mana, she will be more vulnerable to ganks since she won't have the ability to double Distortion to safety.

Overall, giving her ultimate a mana cost should make her laning phase less oppressive without changing her playstyle of quickly applying bursts of damage before returning to safety. She's already difficult to balance due to her kit revolving around bursting her target without giving them time to react, meaning changing her damage would either make her useless or overpowered.

TR;DR: Give Leblanc's R a mana cost to give her a tad more counterplay in terms of fighting her when she's weak (oom). She should have more of a punishment for using her abilities too frequently or misusing her ultimate (say to clear waves), since it's CD is already low.