How many times can you use the Forest Dragon's action? It says "Spend 3 resources to double this unit's power until the end of the turn". However, it doesn't mention how many times you can do this per turn. For example, if you're drawing 12 resources a turn, could you spend all the resources on the Forest Dragon to make it do 48 damage? (6 damage, then 12, then 24, then 48). This seems a bit ridiculous and overpowered to me. But I've not been able to find anywhere that mentions a limit…
P.S. Sorry if this has been asked on the forum before, I wasn't able to find anything in the last year's worth of posts.