You can only use the effect of "Heroic Challenger - Clasp Sword" once per turn
As far as I can tell, the addition of " If your opponent controls any monsters " and " and if you do " would then (if I'm not mistaken) allow this card to be activated pointlessly, even if the opponent has no monsters
With monsters like Elemental Hero Wild Wingman and Elemental Hero Tempest, Polymerization was used to set the pace in most duels, since Elemental Heroes on their own are weaker compared to other cards Fusion summoning was Yuki's win condition in most games
You can only Special Summon Black Chaos the Ultimate Magical Swordsman once per turn this way
Archived from the original on May 6, 2007
Monster Reborn has spent years limited, banned, or closely monitored across formats, a clear sign of how easily it can shift momentum with zero setup cost