Rokket Recharger

If a DARK monster(s) you control that was Special Summoned from the Extra Deck is destroyed by battle or card effect: You can send this card from your hand or field to the GY, then target 1 of those destroyed monsters; Special Summon 1 DARK monster from your GY with a different original name from that targeted monster. You can only use this effect of "Rokket Recharger" once per turn. While you control a DARK monster Special Summoned from the Extra Deck, your opponent's monsters cannot target this card for attacks.

Dragon DARK Effect Monster 4 effect