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Any permanent will do, which means there are plenty of avenues to take

In fact, that's how good detectives are made: by cracking tough cases

It is meaty by itself but scales up pretty rapidly with other dorks in terms of power

The different leaders have different strategies, so one can focus on expensive spells and you can build a more control-oriented deck, while other leaders swarm the battlefield with smaller, cheap creatures that can give you an edge early in the game, and so on

When an aura is on the stack and its target leaves the battlefield or becomes illegal through other means, like instant-speed shroud or protection, the spell fizzles while its on the stack