I just played a brawl match where my opponent played a swiftfoot boots on one turn. After equipping it to one of his creatures i let the attack through. on my turn i banished it using sheltered by ghosts so now my creature had custody of my opponents swiftfoot boots. the very next turn without using any kind of duplicate spell or copy spell my opponent played another swiftfoot boots. idk if that's a bug that they were able to put more than 1 copy in a brawl deck, or if they were cheating. my opponent conceded when i started to gloss over both the the boots on the field controlled by them. Any idea what happened?