Rylai is really weak on Maokai after the slow rework (only the strongest slow is applied).
His Q at max rank slows the enemy by 48%, and Rylai's by 40%. Rylai's passive is ignored.
His W snares the enemy, so slow is irrelevant.
His E slows by 50%, so Rylai's passive is ignored.
His ultimate is the only spell that can make use of Rylai's. Try switching it out for a Rod of Ages. It gives you HP and AP just like Rylai's, but also mana. You probably won't need another mana regen item because of its passive mana regen (or since you took Clarity, it's better to have more mana than mana regen).
Luden's is great since you're slow and it gives you much needed MS. You also have a dash and low CD spells.
I would also suggest an attack speed item like Nashor's Tooth or maybe Wit's End.
In ARAM everyone spams spells, so the attack speed really helps regain your HP. Especially since you had a Ryze (who spams spell) and Skarner (his Q is on 2 second CD or something), the AS would have been really helpful.
I'd call you out on low MR in your build since Maokai has no MR scaling, but since they didn't have that much magic damage I guess it's okay.