Maximizing Magic Resistance

[Inigo Montoya]

I'm interested in determining the absolute maximum for Magic Resistance.

The max default MR I've seen is 20.

If that unit were made a prophet, then it gets a bonus of +5 MR in a province with a dominion of 10.

If the Magic Drain in the province is -2 or -3, then the unit would get +1 MR.

Resist Magic provides +4 MR.

Picus's Axe of Rulership grants +2 MR.

An Amulet of Antimagic offers +4 MR (is this cumulative with Resist Magic?)

I have never seen this, but does a sufficiently high level of experience increase MR?

Is there a Heroic Ability which improves MR?

So far, the maximum MR seems to be 36, but I'd love to hear from the Masters. What have I left out?