Majesty Maiden, the True Dracocaster (MP18-EN004)

To Tribute Summon this card face-up, you can Tribute a Continuous Spell/Trap you control, instead of a monster. Once per turn, when your opponent activates a card or effect while you control this Tribute Summoned monster (Quick Effect): You can add 1 "True Draco" or "True King" monster from your Deck to your hand.

Wyrm / Effect, 2018 Mega-Tin Mega Pack