set_cube_fetcher.js

 /**
 * http://gatherer.wizards.com/Pages/Search/Default.aspx?sort=cn+|rarity+&action=advanced&output=checklist&set=%20[%22Dominaria%22]&type=%20![%22Land%22]%20![%22Planeswalker%22]
 */
(function(rows){
  var row, info, output = [];
  var countMap = {
    C: 3,
    U: 2,
    R: 1,
    M: 1
  };

  function formatRow(data) {
    return '| ' + data.join(' | ') + ' |';
  }

  output.push(formatRow(['Have', 'Need', 'Name']));
  output.push(formatRow(['----', '----', '----']));

  for (var i = 0, len = rows.length; i < len; i++) {
    row = rows.item(i);

    info = [0];
    info.push(countMap[row.querySelector('.rarity').textContent]);
    info.push(row.querySelector('.name').textContent);

    output.push(formatRow(info));
  }

  console.log(output.join("\n"));
})(document.querySelector('table.checklist').querySelectorAll('tr.cardItem'));