Dual Nature doesn't work properly.
What it is doing in XMage: Controller of
Dual Nature gets token copies of non-token creatures that enter.
What it is supposed to do: Controller of non-token creature that enters creates a token copy.
In other words, it's supposed to be a group hug card, not an enchantment version of
Faerie Artisans on steroids.
Also, bear in mind, the player who creates the token is the player who controls the creature when the ETB
Dual Nature trigger resolves (so for example if I summon a creature and before
Dual Nature trigger resolves an opponent gains control of that creature, the creature's new controller will get the token).
TheElk801: Fixed beyond 1.4.26V5