What you need:

1. Spinach

2. Strawberries

3. Two bananas

4. Blender

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What you need to do:

1. Add one cup of spinach

2. Add one cup of strawberries

3. Add the two bananas

4. Blend

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Now your "Potion" is ready. Don't really try to turn into someone else, even though the Metajuice is meant for metamorphosis.