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The format becomes "big basics only or you lose", which is the exact same reason Overconfident Sableye was soft banned and forced an early rotation

Sure, you have to own the banned card, but who wouldnt want to be able to snag a Leovold, Emissary of Trest, from outside the game

(2020-06-23) Massacre Wurm's triggered ability triggers if a creature an opponent controls dies for any reason, including from its first ability reducing its toughness to 0, as long as Massacre Wurm remains on the battlefield

However, it does give you energy all on its own and because it also returns to your hand when you activate it, its going to keep giving you energy