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While you could argue that this means that merfolk count, my take is that its templated this way so that you dont bounce the merfolk who may happen to be your commander or part of your Limited/Constructed strategy with Slinn Vodas enters ability

Arenas play blade shows your recent play history and makes it easy to resume the action

Stax decks want to prevent your opponents' decks from functioning by taking away their abilities, ability to untap, and things of that nature

It also helps that its limited by mana, because it means it draws a little less heat (more on that later), which means opponents will sometimes let you get a few triggers because it usually wont immediately end the game