Crime Scene

Whenever you cast an instant or sorcery spell, put a clue counter on Crime Scene.
{w/u}, Remove a clue counter from Crime Scene: Draw a card then discard a card.
At the beginning of your upkeep, if Crime Scene has five or more clue counters on it, detain target nonland permanent an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)