Hello all. I'm new to the game and I've been doing a lot of rules research and I have been able to answer all my questions so far but one.
How often can you take an action on a card? I would assume it's once per phase or turn but I can't find anything to back this up. For example Haemonculus Tormentor has the ability "Action: pay 1 (resource) to give this unit +2 ATK until the end of the phase." Could I pay 2 resources to increase his attack by 4?