Converging Wishes (DUSA-EN037) [Duelist Saga]

If you have 5 or more Dragon-Type Synchro Monsters with different names in your Graveyard: Special Summon 1 "Stardust Dragon" from your Extra Deck (this is treated as a Synchro Summon), but banish it during the End Phase. Equip it with this card. While equipped, it gains ATK equal to the combined ATK of all Dragon-Type Synchro Monsters in your Graveyard. Also while equipped, when it destroys an opponent's monster by battle: You can banish 1 Dragon-Type Synchro Monster from your Graveyard; it can attack an opponent's monster again in a row.