Phase Rush is just a better 3 proc Ryze MS Q passive; substitute Ryze Q MS boost for Spellvamp
Spell Vamp + Shield for 2 seconds. Hardly ab-usable early game since CDs are pretty high and mana dependent, but late game Ryze becomes a monster dueler. 2 seconds is hardly enough time to get really good spell vamp so this encourages proper timing and spacing of abilities. Ryze deserves to be a battle mage not a wave clearing, split pushing, running away mage.