When you cast it, you get to make tokens of it according to the storm count, and those tokens buff each other
In any case, there is actually information to be gleaned from the image

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Mirror EntityMirror Entity works very well with a team full of +1/+1 counters, as those counters will still add beef to your creatures' stats after Mirror EntityMirror Entity increases their base size
theyve woven themselves into the fabric of popular culture