I never seem to get this straight in my head and I don't have access to the Core book at the moment, so I thought I'd ask here as it's easliy answerable.
If you play an action card with lines like this:
1 Hammer: Normal damage
2 Hammers: damage +2
1 Boon: 1 less recharge token
3 Boons: +1 Critical
How many sucsesses and boons would I have to roll to get all the effects of the card?