mtg the end card (Card) then sacrifices all creatures he or she controls End the Festivities | Innistrad:

And then when it cold clocks you, it will follow up with some cascading fun

That effect helps aggressive decks churn through cards at a healthy rate, and it plays into the type of strategy Emberheart Challenger slots right into, with prowess decks often employing pump spells that target their own creatures

Kwain, Itinerant Meddler Kwain, Itinerant Meddler makes a perfect group hug commander

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Obviously since I didn't finish yet, there will be more stories to come