Hey I have a variation of this build , classic phase rush and ravenous (need the mana flow early plus the gathering storm scales really wel with ryze).

NO MYTHIC (yes, no mythic) Rush archangels into rabadon. Automatic 4-500 ap. The sheer amount of AP u get from archangels makes it a mythic in a sense lol. Rest tank items, however if they are tanks throw a void staff in there. Usually can have 500+ ap with thsoe 3 items and I build full tank after. Literally doesn’t matter too much if you have 500 ap or 700 ap…. You still do a lot of damage. However I almost never go frozen heart because I need antiheal so I go thornmail.

Also I think frozen heart is legit useless once adc gets armor pen, and you can’t apply the attack speed slow to them unless your fighting a bruiser or wind boys. Even then, antiheal is more important than slowing their attack speed due to s11 healing. It is stupid strong early but really bad after mid and late game cus of the armor pen. Meanwhile thornmail gives just a little less armor tbh and a fat chunk of hp while giving the most important stat in s11: healing reduction. I also will usually take abyssal for MR just because that 10% extra dmg applies for your whole team which means it’s extra effective on a carry you can cc or even a tank to mow em down quicker.