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There is no shortage of cards that force sacrifice available in Mardu colors, including ones that sacrifice the entire battlefield

Apart from us speculating and asking questions on Reddit and the MTG Arena Forum, WotC kept quiet on the topic for a couple years following that announcement

You can't just weave these into any of our products, but when you're doing these one-off cards and you're trying to build a Chun-Li that's gonna go on to live a wonderful life in Commander decks where people are pulling through all of Magic, it just unlocks all of that. Heggen says that Commander is the primary lens through which [were] viewing these, but that theres no arbitrary threshold they have to hit in terms of viability or popularity in the format

The only borderless cards that drop in this slot are the borderless planeswalkers