His SP says:

Ghost Rider deals penetrating damage to opposing characters that have damaged a friendly character since your last turn.


This would include his poison as well as his attacks, correct?

Yes, all his damage would be penetrating, since it does not specify his attacks.

Since we are here, and the power says "to opposing characters that have damaged" and makes no mention of attacks, how does something like Mystics play into this?

Mystics is already unavoidable damage, so the SP doesn't exactly help or hinder the TA.

he referring to on your turn have a pog roll and hit a mystic, that mystic now damaged one of your figures, so would his SP kick in or not.

yup! sorry for not being clear (I forgot he had mystics)

To which I would say yes, his SP kicks in. Nowhere in his SP does it say that the friendly character has to be Damaged from an attack, it simply says that when a friendly character is Damaged by an opposing character.

Thanks much - I figured as much, but sometimes you need Bill Clinton to figure out what some of the words mean

I disagree on the Mystics piece. If Mystics does not trigger Bag-Man's trait b/c it does not qualify as "damage" from the fig, then I don't see how it works for Ghost Rider. All those loopholes (force blast into a wall, Incap, etc.) work against Ghost Rider as well as since the damage occurs after the action performed by the character.

FB and Incap are not from the character.
Mystics is from the character.
Bagman does not activate off of Mystics because its not an attack.

KICK ME!: Whenever Bombastic Bag-Man takes damage from an attack, deal the attacker penetrating damage equal to the damage taken by Bombastic Bag-Man. Bombastic Bag-Man can't be healed except by the Fantastic Four team ability.

Because Bag-Man's power says from an attack.

I still do not think Mystics fits into the equation.

Then explain why Arcade benefits from Armor Piercing.

You simply need to look at the two and compare them:

MYSTICS
When a character using the Mystics team ability takes damage from an attack, the attacker is dealt 1 unavoidable damage. This damage is not an attack.

Penance Stare: Ghost Rider deals penetrating damage to opposing characters that have damaged a friendly character since your last turn.

So, was your character Damaged since your last turn? If they hit a Mystic, they sure were. Does Ghost Riders SP say that your character had to be Damaged from an attack? No. It simply had to have taken Damage from an opposing character since your last turn. Therefore his SP activates, and he can deal Penetrating Damage to that Mystic this turn.

Oh my....me and my 3 Squirrel Girls (and all those Monkey Joes) are gonna have much, much fun teaming up with Ghost Rider. I am literally LOLing right now just thinking about it.