.card-link {
    position: relative;
    display: inline-block;
    text-decoration: underline;
}

.card-link:hover::after {
    content: '';
    display: block;
    position: absolute;
    z-index: 100;
    top: 20px;
    left: 100%;
    width: 200px;
    height: 200px;
    background-size: contain;
    background-repeat: no-repeat;
}

.card-link[data-image="2/2-01ナイトメア.png"]:hover::after {
    background-image: url('https://w.atwiki.jp/ultimete1/attach/11/2/2-01ナイトメア.png');
}

.card-link[data-image="2-02_IceSerpent.png"]:hover::after {
    background-image: url('https://w.atwiki.jp/ultimete1/pages/123/2-02_IceSerpent.png');
}