Instead of attack speed on Ezreal's passive...
Rising Spell Force - Whenever Ezreal lands a spell, he gains 5% armor penetration and magic penetration, stacking up to 5 times.
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Neither AD nor AP Ezreal use their autoattacks very often, instead preferring to use his very long range spells. Ezreal is not a damage-oriented ADC.
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Ezreal gains the only MR black cleaver in the game, making him an attractive latter pick against tanky teams. Niche becomes deeper.
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With a Last Whisper and a Void Staff, Ezreal becomes the only ADC in the game that doesn't rely on percent max health damage to do reliable (but not over-the-top) damage to tanks.