Shadow Impulse (DRLG-EN032) - Dragons of Legend Unlimited

When a Synchro Monster(s) you control is destroyed by battle or by card effect and sent to the Graveyard: Target 1 of those Synchro Monsters; Special Summon from your Extra Deck, 1 Synchro Monster with the same Level and Type as that monster but with a different name. You can only activate 1 "Shadow Impulse" per turn.