Does veers command card ( I forgot the exact name of it but it’s his number 1 pip card) let him attack twice?

Also, does arsenal keyword stack? Meaning for an atst with two arsenal 2’s does it get to use up to 4 weapons dice pools?

For the first question, yes, Veers can make an attack as one of its actions and then at the end of that activation he can perform an attack with the weapon specified on the card.

For thw second, yes too, all abbilities in the game which have numbers stack