Do Ardent Censer Stack?

Heal/shield bonus no longer stacks across multiple Ardent Censers. ... The three different sources of the effect still stack with each other, but we're ensuring Censer users aren't abandoning the rest of the shop.

Does Mikael and ardent stack?

Edit: Wikia says they stack together additively. Ardent Censer's bonus healing and shielding passive stacks additively with Forbidden, Mikael's Crucible and Windspeaker's Blessing.

Does ardent censer increase self healing?

Ardent Censer is an item that increases the amount of healing and shielding a champion can do, but it also applies on-hit damage and attack speed to those you shield.