Cactus Game Design Message Boards

Well, I keep forgetting to ask this, not anymore! If I use Stalks O' Flax to exchange heroes, are they still considered my opponent's heroes? If so, could I then use cards like Madness or Unknown Nation? I'm guessing this doesn't work for exchanged heroes, since they are temporarily your heroes, but what if I band to an opponent's hero?

Madness
Type: Curse • Brigade: Orange • Ability: 1 / 5 • Class: None • Special Ability: If opponent’s Hero is in battle, you may convert this card to an orange brigade Evil Character and add it to battle. Cannot be interrupted. • Play As: When holder chooses, holder may convert this card to an orange brigade Evil Character and add to battle. Cannot be interrupted. • Identifiers: Generic OT Genderless (not Human, not Demon)

Unknown Nation
 Type: Curse • Brigade: Gold • Ability: 0 / 6 • Class: None • Special Ability: If opponent’s Hero is in battle, you may discard this card to search draw pile for a human Evil Character and add it to battle. Cannot be interrupted. • Play As: If opponent’s Hero is in battle, when holder chooses, you may discard this card to search deck for a human Evil Character and add to battle. Cannot be interrupted. • Identifiers: OT, Depicts an Idol

Incorrect. "Opponent's" refers to ownership and control. Your opponent only has control of stalked Heroes. It's weird, but exchanged cards are not "your" or "opponent's." Maybe they're Santa's?

If I'm not mistaken you can only use Unknown Nation and Madness to add characters to battle if you are blocking. you can't add characters to your opponent's side of battle.

 the REG defines: “opponent's” means the other player whose character is fighting your character in bat­tle.