I have a list of questions after a few games:

1. "Each undamaged creature" (ex. Pandemonium). Does this mean regardless of Friendly AND Enemy?

2. Does the "deal x damage" phrase ignore the DEFENSE stat of any creature affected by the card? Or do you still remove DEFENSE from the "x" value?

3. Can you have more than one upgrade on a creature?

4. If for some reason, I cannot draw a card in my draw step, does my Chain Tracker still go down one?

Thanks!

1. Yes.

2. No, it doesn't ignore the armor. However, the creature might have already lost some armor to other damage that turn. Armor resets at the end of each turn.

3. Yes.

4. No, it doesn't go down. This clarification has been added to the rules recently.

17 minutes ago, A1win said:

2. No, it doesn't ignore the armor. However, the creature might have already lost some armor to other damage that turn. Armor resets at the end of each turn.   

I must have missed that. Does that mean that the Armor value is only taken into account until its used up? Not PER Attack? That's huge.

If the first attack removes all of the armor, yes. Otherwise, the rest of the armor will absorb any further damage that turn. From the rulebook (emphasis on the bolded parts):

ARMOR

Some creatures have an armor value to the right of the card title. Armor prevents an amount of damage equal to the armor value that the creature would take each turn . For example, if a creature has two armor and is dealt one damage, that damage is absorbed by the armor, leaving the creature with one armor for the rest of the turn . If the creature is later dealt three more damage during that turn, one damage is absorbed and the other two damage are dealt to that creature.

5 hours ago, hendersondayton said:

I must have missed that. Does that mean that the Armor value is only taken into account until its used up? Not PER Attack? That's huge.

Per turn yes, the armor resets at the beggining of each turn effectively.