laststicker.user.js

// ==UserScript==
// @name         LastSticker
// @version      0.1
// @author       crashmax
// @match        https://www.laststicker.ru/cards/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=laststicker.ru
// @grant        none
// ==/UserScript==

const missingCardsList = []
const cardsInfoContainer = document.querySelector('.cards_info')
const cardsList = Array.from(
  document.querySelectorAll('tbody > tr.even, tr.odd')
)

for (const card of cardsList) {
  const trCount = card.children[7]
  if (trCount.classList.contains('i_hold')) {
    continue
  }
  missingCardsList.push(card.firstChild.textContent)
}

if (!missingCardsList.length) return

const textareaCardList = document.createElement('textarea')
textareaCardList.value = `${missingCardsList.join(', ')}\n${missingCardsList.length} карт`
Object.assign(textareaCardList.style, {
  width: '100%',
  height: '100px',
  padding: '5px',
  marginBottom: '1rem',
  fontSize: '1.2em',
  fontWeight: 'normal'
})
cardsInfoContainer.prepend(textareaCardList)