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Commander precons arent for new players, which is why Spider-Man is going with a different product strategy
You can fully get rid of your opponents creature with some additional investment without the fear of having it return the battlefield when yours leaves
This is a heavily equipment-focused deck (as if having 16 equipment cards didnt give that fact away already)
If, during your declare attackers step, Ursine Monstrosity is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under your control continuously since your turn began (and doesn't have haste), then it doesn't attack