Majesty Maiden, the True Dracocaster (MP18-EN004) [2018 Mega-Tins Mega Pack]

To Tribute Summon this card face-up, you can Tribute a Continuous Spell/Trap Card 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.