Drop of Honey [Arabian Nights] 180 if your other DARK Spellcaster

if your other DARK Spellcaster monster battles an opponent's monster (Quick Effect): You can send this card from your hand or face-up from your field to the GY

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The complete Ancient Guardians booster set contains 60-cards:

1 Strength of the Tajuru

or Main Set Extended-Art (Rare or Mythic)

Drop of Honey [Arabian Nights] 180 if your other DARK SpellcasterSet: Arabian Nights Type: Enchantment Rarity: Rare Cost: {G} At the beginning of your upkeep, destroy the creature with the least power. It can't be regenerated. If two or more creatures are tied for least power, you choose one of them. When there are no creatures on the battlefield, sacrifice Drop of Honey.