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(In other words, you typically cant attack an enemy character that is still upright/ready they have to have exerted themselves, usually by questing, making them vulnerable.) To challenge, you exert your character and choose an opponents exerted character to attack

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Then this is your system

Its blasphemy to think this merfolk might fit better than the Lab Man for the Lab Plan, one executed by combo decks from Moderns Cheerios and Ad Nauseam to Oops, All Spells in Legacy (and many, many Commander lists featuring Hermit Druid)