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(3) When your opponent activates a card or effect in response to the activation of your Fusion Monsters effect (Quick Effect): You can banish this card from the field, and if you do, negate that opponents effect, and if you do that, banish that card

The Johtull Wurm is apparently super weak towards multiple blockers, as the flavour text mentions

The idea is that youll make your opponents exile their creatures when you sacrifice yours

Im pretty undecided on how good this card will be, but with the format trending toward one where incidental treasure builds up like unwanted house guests, giving an opponent two Lotus Petals is probably a lot less of a problem than it might have been five years ago

Forcing your opponents to attack opens them up to retaliation and lets you block creatures they might be intentionally keeping out of combat