Forum:Mask Change Card Ruling Help

SO I was in a tournament and was using Masked HEROs because they are fun. When I attempted to use mask change during the battle phase from my hand, my opponent told me that was an illegal move. When I explained this to the Tournament leader, he agreed with my opponent, saying it had to be face-down. For those of you who don't know, Mask Change is a quick-play spell card that targets a face-up hero you control and summons a Masked HERO from your extra deck with the same attribute. There was nothing on the field prohibiting the summon (like vanity's emptiness) and there was only one monster besides my HERO on the field, a face down. Please help, and tell me who was wrong. Also, please show a ruling or such on where you got your evidence, so I can be sure. Thanks! Genesis1221 (talk • contribs) 13:50, May 10, 2017 (UTC)