If you have them paired with the right cards and have a certain measure of luck, you are bound to win, despite what your opponent might throw at you
However, there are situations where you can survive without copying, such as a card like a glorious military song, or a copy of a creature with immortality, then dying and then returning to the battlefield with a +1/+1 counter on it by the immortality ability
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Lost Abyss Booster Pack
Similarly, despite how strong Supporter cards are, they're balanced around the fact that you can only use one every turn
You can also make use of fight effects, but those tend to be far riskier since the opposing creature will also damage yours