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And would a deck built post-FIRE design last longer

This is pure value in decks that thrive on landfall or bird creature ETBs

Black is the primary color of sacrifice, so it is trivial to sacrifice your creature for value while gaining life and burning opponents with Vengeful Bloodwitch

Unfortunately the ability can only be activated on your turn, but with the aggressive leanings of this commander I think you want to be going for the acorns anyway

Just think of Grunn, the Lonely King attacking alone with Rafiq on the battlefield: Grunn doubles its power and toughness, gets any exalted triggers, and then gains double strike to smash in for over twenty points of damage