Yuumi should be encouraged to move between targets rather than just sitting on the most fed champion

These are just examples to show what I mean, rather than actual considerations to be made on how this could be done. Maybe her heal is greatly reduced when used twice on the same target. Performing abilities from a new teammate, could reduce the ultimate cooldown by X seconds (can only occur at Z minutes, per champion) There are probably much better solutions to this issue, however, whether she should be rewarded for switching OR punished for babysitting a champion is a design choice from riot games point of view. Maybe a combination of both would be the best solution.
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