Cassiopeia: Mana and Health sustain on the strongest dueling mage
Why did she need these mechanics exactly?
Most poke cooldowns are rather long, negated by her inherent pushing. Combining HEAVY dual-sustain with the insane all in pressure any time she lands a single Q, her lane phase is currently way out of line. I don't imagine any reliable counterplay other than "literally camp the bajesus out of it." Which isn't reliable really.
No other champion in the game gets health and mana/energy back for a single spell, excluding spell vamp. Sustain isn't central to cassiopeia's dueling identity at all. Talking about Strategic Diversity in terms that cassio can either sit back and stack up the farm with her passive or build it by playing aggressively, where's my strategic diversity? "stay completely outside of twin fang range literally the entire game" isn't very effective or interesting.
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