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Whenever Thousand Moons Crackshot attacks, you may pay {2}{W}. When you do, tap target creature.
You don't choose a target for Thousand Moons Crackshot's triggered ability at the time it triggers. Rather, a second "reflexive" ability triggers when you pay {2}{W} 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.
