Generated by SassMeister.com.

SassMeister-input-HTML.jade

p.red red
p.orange orange
p.yellow yellow
p.green green
p.blue1 blue1
p.blue2 blue2
p.purple1 purple1
p.purple2 purple2

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

@import "sass-list-maps";

$variant: 'us';

$_lotteries: (
    us (us-powerball, mega-millions)
);

@each $variant in $_lotteries {
  $variant-lotteries: map-get-z($_lotteries, #{map-keys($variant)});
   // It will not loop over each lottery for the us variant
  @each $lottery in $variant-lotteries {
     .test {
        lottery: $lottery;
     } 
  }
}

SassMeister-output.css

.test {
  lottery: us-powerball;
}

.test {
  lottery: mega-millions;
}

SassMeister-rendered.html

<p class="red">red</p>
<p class="orange">orange</p>
<p class="yellow">yellow</p>
<p class="green">green</p>
<p class="blue1">blue1</p>
<p class="blue2">blue2</p>
<p class="purple1">purple1</p>
<p class="purple2">purple2</p>