1) When I use Welder, can I opt to attach no [R] Energy from hand, or do I need to attach at least one? 2) If zero does indeed count as an option for "up to" in this case, would that still satisfy the second clause and allow me to draw three cards? I believe the intent of the card is that I must attach at least one [R] Energy card from hand in order to use Welder at all and that I may only draw if I attached at least one [R] Energy from hand. However, there are other places where "up to" does include "zero", and given how significant a difference this could make to Welder's usage, decided to go ahead and ask. Thank you!