The mechanic has also been used on Devouring Hellion in War of the Spark , but it applied to creatures and planeswalkers like a devour 2 just without keywording
However, I think the bigger opportunity is that this feels like the core to a strong Boros aggro deck: Particularly with all the Heroic+Valiant in Boros
This basically doubles your life total and allows you to take out one player who had less life than what you started with
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Assassins, Mercenaries, and Rogues you control have deathtouch and "Whenever this creature deals combat damage to a player, you may remove a hit counter from a card that player owns in exile
And that gives me goosebumps every time I bring it up, because the idea of bringing families together, or friends together to sit down and make memories, that's why I'm in this business