I have come up with 2 changes to Janna and honestly they're incredibly stupid
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make her MS buff only apply when retreating from enemies, this way she's not some Zerg bot as well as MC Hammer staring in Cant Touch This
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her shield gives AD, each time an auto attack/AD ability is used while an ally is shielded, a percentage of the damage dealt from this ability/auto attack absorbs the shield. This say she can't give the best of both worlds: a massive shield and steroid.