I see that Fell Viridio and Norge devil forms both can add to a combat check (if not playing a 2-handed weapon). If I have both forms displayed, do they stack on a combat check (for a +3 total) or does that count as playing two cards of the same type and therefore I can only choose one of them to use (+1 or +2)?
Thanks.
You can use them together for a +3 total; in fact, if both are displayed (and the bane isn't immune to Poison or Fire) you must add +3 if you can, because neither effect is optional.
You're correct that you can only play one card of a given type on a check, but you're only playing a displayed card if you choose to perform an action with it, so a static 'passive' effect such as the +1/+2 doesn't count as playing a card. However, using Norge or Fell Viridio's "additionally banish a card" power would count as playing them, so you can't banish a card from both Norge and Fell Viridio on the same check.
Anyone can play a card whenever the card allows it. Playing a card means using a power on that card by performing an action with that card that is specified by the card itself. You must do everything the power says when possible. When you play a boon has several powers, you must choose only one of them.
Choosing to activate a power on a character or on a displayed card also counts as playing that card.
Also note: you are only restricted to playing one of each type of boon on each check. Cohorts are not boons, and therefore are not limited.
Ah, I rescind my statement about using both Fell Virido and Norge's "additionally" powers on the same check, then. I forgot about that.