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HTML 

              
                mixin makeItems(itemCount, trail=false)
  -var i = 0
  while i < itemCount
    if trail 
      li.trail
         .sparkles
    else 
      li 
    -i++
      
.container  
  ul.stars
    +makeItems(60)
  .cloud
  .cloud
  .magic-mountain
    .eyes 
  ul.hills.back-hills
     +makeItems(5)
  ul.hills.mid-hills
     +makeItems(7)
  ul.hills.front-hills
     +makeItems(10)
  ul.spell-trail
     +makeItems(10, true)
  .kamek 
     img(src="https://i.imgur.com/QNdo6Yk.png" alt="Kamek" title="Kamek")
!

CSS 

              
                $white: #fffaf0;

// Scene vars
$container-size: 450px;
$night-sky: linear-gradient(to bottom, #360033, #0b8793);
$night-sky-fallback: #2a0845;

// mountain vars
$mountain-border-radius: 200px;
$front-hills:#3b0a30;
$mid-hills: #6a3964;
$back-hills: #522057;
$magic-mountain-color: #311c30;

// Trail vars
$steps: 10;
$saturation: 80%;
$lightness: 60%;
$hue-offset: 320;
$trail-height: 500px;
$trail-width: calc(460px / 10);
$trail-radius: 23px;
$trail-opacity: 0.6;

// animation vars
$kamek-timing: 6s;
$trail-timing: 6s;

// Color lists
$hsl-colors: ();
$bg-colors: ();

// Populate $hsl-colors with calculated colors
// These will be used to create the gradients in the second for loop
@for $i from 1 through 11 {
  $color: hsl(360 / $steps * $i + $hue-offset, $saturation, $lightness);
  $hsl-colors: append($hsl-colors, $color);
}

// Define gradients with the newly created colors from $hsl-colors
// Then, populate $background-colors with these newly created gradients
@for $j from 1 through 10 {
  $bg: linear-gradient(to right, nth($hsl-colors, $j), nth($hsl-colors, $j + 1));
  $bg-colors: append($bg-colors, $bg);
}

// Returns a random number given a min value
// and max value
@function randomNum($min, $max) {
  $rand: random();
  @return ($min + floor($rand * (($max - $min) + 1)));
}

// Creates mountain ranges
@mixin createHills($numHills, $minWidth, $maxWidth, $minHeight, $maxHeight) {
  @for $i from 1 through $numHills {
    &:nth-child(#{$i}) {
      width: randomNum($minWidth, $maxWidth);
      height: randomNum($minHeight, $maxHeight);
    }
  }
}

body {
  background-color: $white;
}

ul {
  list-style: none;
  padding-inline-start: 0;
}

.container {
  background: $night-sky-fallback;
  background: $night-sky;
  border-radius: 100%;
  height: $container-size;
  left: 50%;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: $container-size;
  overflow: hidden;
  /* this fixes the overflow:hidden in Chrome */
  -webkit-mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC);
  mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC);

}

.stars {
  width: 100%;
  height: 400px;
  li {
    position: absolute;
    background-color: rgb(255, 242, 123);
    border-radius: 100%;
    @for $i from 1 through 60 {
      &:nth-child(#{$i}) {
        $starSize: randomNum(0, 3px);
        width: $starSize;
        height: $starSize;
        left: randomNum(0, 400px);
        top: randomNum(0, 350px);
      }
    }
  }
}

.cloud {
  width: 60px;
  height: 60px;
  border-radius: 100%;
  background-color: rgb(79, 111, 160);
  position: absolute;
  left: -30%;
  top: 10%;
  box-shadow: inset 10px 10px rgb(23, 30, 54);
  animation: moveCloud 60s 1s infinite;
  &:before {
    content: '';
    position: absolute;
    width: 55px;
    height: 55px;
    left: 30px;
    border-radius: 100%;
    top: 20px;
    background-color: rgb(79, 111, 160);
  }
  &:after {
    content: '';
    position: absolute;
    width: 60px;
    height: 60px;
    left: -20px;
    border-radius: 100%;
    top: 10px;
    background-color: rgb(79, 111, 160);
    box-shadow: inset 10px 10px rgb(23, 30, 54);
  }

  &:nth-child(2) {
    left: -50%;
    top: 20%;
    animation: moveCloud 100s 2s infinite;
  }
}

.hills {
  position: absolute;
  width: 460px;
  height: 200px;
  display: flex;
  align-items: flex-end;
  li {
    border-top-left-radius: $mountain-border-radius;
    border-top-right-radius: $mountain-border-radius;
  }
}

.magic-mountain {
  position: absolute;
  width: 150px;
  height: 300px;
  top: 32%;
  right: 60%;
  border-top-left-radius: $mountain-border-radius;
  border-top-right-radius: $mountain-border-radius;
  background-color: $magic-mountain-color;
  box-shadow: inset 10px 10px darken($magic-mountain-color, 10%);

  .eyes {
    position: absolute;
    display: flex;
    justify-content: space-between;
    width: 50%;
    left: 25%;
    top: 20%;

    &:before,
    &:after {
      content: "";
      width: 20px;
      height: 50px;
      background-color: black;
      border-radius: 100%;
      transform: scaleY(0);
      animation: wakeUp 2s 2s ease-in-out forwards, blink 4s 4s ease-in-out infinite;
      transition: 0.5s ease;
    }
  }
}

.front-hills {
  top: 67%;
  li {
    background-color: $front-hills;
    box-shadow: inset 5px 10px darken($front-hills, 10%);
    @include createHills(10, 300px, 400px, 100px, 200px);
  }
}

.mid-hills {
  top: 70%;
  li {
    background-color: $mid-hills;
    box-shadow: inset 5px 10px darken($mid-hills, 10%);
    @include createHills(7, 300px, 500px, 100px, 310px);
  }
}

.back-hills {
  top: 72%;
  li {
    background-color: $back-hills;
    box-shadow: inset 5px 10px darken($back-hills, 10%);
    @include createHills(5, 300px, 500px, 200px, 330px);
  }
}

.kamek {
  animation: fly $kamek-timing linear infinite;
  position: absolute;
  transform: scaleX(-1) rotate(10deg);
  top: 30%;
  left: -100%;
  z-index: 2;
}

.spell-trail {
  display: flex;
  opacity: $trail-opacity;
  height: 500px;
  width: 460px;
  position: absolute;
  top: 45%;
  transform-origin: center;
  z-index: 1;
  // align-items: flex-start;
  // with help from https://bennettfeely.com/clippy/
  clip-path: polygon( 15%, 100% 0, 100% 100%, 0 100%);
  -webkit-clip-path: polygon(0 15%, 100% 0, 100% 100%, 0 100%);

  .trail {
    height: 0;
    min-height: 0;
    position: relative;
    width: $trail-width;
    flex: 1;

    $delay: 0.8s;
    $percentage: 10%;

    // Creates a new rainbow trail with it's own animation
    @for $i from 1 through 10 {
      &:nth-child(#{$i}) {
        animation: createTrail $trail-timing $delay ease-in infinite;
        background-image: nth($bg-colors, $i);
        border-bottom-left-radius: $trail-radius;
        border-bottom-right-radius: $trail-radius;
        $delay: $delay + 0.2s;

        // image source: https://codepen.io/simeydotme/pen/PrQKgo
        .sparkles {
          background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/13471/sparkles.gif");
          background-position: $percentage 0;
          border-bottom-left-radius: $trail-radius;
          border-bottom-right-radius: $trail-radius;
          height: 100%;
          mix-blend-mode: color-dodge;
          width: $trail-width;
          $percentage: $percentage + 10%;
        }
      }
    }
  }
}

@keyframes fly {
  50% {
    left: 110%;
    top: 10%;
  }
  51% {
    transform: scaleX(-1) rotate(10deg);
    top: 30%;
  }
  52% {
    transform: scaleX(1) rotate(10deg);
  }
  100% {
    transform: scaleX(1) rotate(10deg);
    left: -100%;
    top: 10%;
  }
}

@keyframes createTrail {
  25% {
    height: $trail-height;
    opacity: 1;
  }
  65% {
    height: $trail-height;
    opacity: 0;
  }
  100% {
    height: 0;
    opacity: 0;
  }
}

@keyframes wakeUp {
  60% {
    transform: scaleY(0);
  }
  100% {
    transform: scaleY(1);
  }
}

@keyframes blink {
  0% {
    transform: scaleY(1);
  }
  18% {
    transform: scaleY(1);
  }
  20% {
    transform: scaleY(0);
  }
  25% {
    transform: scaleY(1);
  }
  38% {
    transform: scaleY(1);
  }
  40% {
    transform: scaleY(0);
  }
  45% {
    transform: scaleY(1);
  }
  80% {
    transform: scaleY(1);
  }
  100% {
    transform: scaleY(1);
  }
}
@keyframes moveCloud {
  100% {
    left: 150%;
  }
}
!

JS
!
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