The US Supreme Court has nearly complete discretion to decide which cases it will hear. Explain which attributes are most

The US Supreme Court has nearly complete discretion to decide which cases it will hear. Explain which attributes are most likely to get the petitioner a coveted writ of certiorari from the US Supreme Court? (Note: not what attributes are likely to get the petitioner the outcome she/he desires—only to get his/her case heard).
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Discussion post, min 150 words with references