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The chances of your moves having no effect whatsoever are slim and are tied to certain types like Normal and Fighting against Ghost types, Electric against ground types, and Dragon against Fairy types, for example

As with other transforming double-faced cards, it's important to remind ourselves that the cards characteristics color, mana value, type are whats printed on the front face , and if the card leaves and returns to the battlefield, it returns on its front face

For four mana, you get an Artifact that you can tap to flip a coin, and if you win that flip, then you get to destroy all nonland permanents

It won't deal regular combat damage unless you bring your life total back above 25 before the regular combat damage step