However, after your opponent donates Akroan Horse to you, you become responsible for its second triggered ability. The controller of a triggered ability from a permanent is the player under whose control the ability triggered, regardless of who originally owned the card causing the effect to happen. Since you’re the controller, you can’t “forget” about the ability on purpose: doing so is cheating! Regardless of whether your opponent reminds you of the ability, you’ll have to give your opponent a soldier token.
Today’s Tournament Tip written by Jen Wong