Doki Doki (MP17-EN144) [2017 Mega-Tins Mega Pack]

You can discard 1 Rock-Type monster; Special Summon from your Deck, 1 Rock-Type monster that has the same original Attribute and Level as that monster, in face-up Attack Position or face-down Defense Position. You can only use this effect of "Doki Doki" once per turn.