That permanent gains haste, "When this permanent leaves the battlefield, it deals damage equal to its mana value to each creature," and "At the beginning of your end step, sacrifice this permanent." If a permanent has in its mana cost, X is 0 for the purpose of determining its mana value
You want to ship fast, ideally within one business day, and quick dispatch is one of the simplest ways to earn good feedback
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Behind him, the female form makes a cameo appearance her softer shape and colours providing visual balance and a subtle reference to the species duality
Ramp is also really important, and the two are intertwined
There is some variance in shape, but it's pretty obvious that it is supposed to be a triangle, full circle, or even an acorn