How does cost reduction work with Battering Ram and Void Rush? | tcgmode

if I play void rush and reveal battering ram, having played 3 cards in total that turn (including void rush), does Battering Ram cost 1 or 0? his effect would make him cost 2 energy, and Void Rush reduces cost by 2, but does it do it before or after the Ram reduction? if before - ram costs 5, r...