Destiny HERO - Dogma (SGX1-ENB07) - Speed Duel GX: Duel Academy Box 1st Edition

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by Tributing 3 monsters, including at least 1 "Destiny HERO" monster. Once per turn, if you still control this face-up card during your opponent's next Standby Phase after you Special Summoned it this way: Halve your opponent's LP.