You don’t choose a target for Generous Plunderer’s first triggered ability at the time it triggers. Rather, a second “reflexive” ability triggers when you create a Treasure token this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal. Notably, the triggered ability isn’t a crime, but the reflexive triggered ability potentially is.
Menace
At the beginning of your upkeep, you may create a Treasure token. When you do, target opponent creates a tapped Treasure token.
Whenever this creature attacks, it deals damage to defending player equal to the number of artifacts they control.
