Dark Synchro Dark Tuner Monsters

A Dark Synchro Dark Tuner Monster is a group of Dark Synchro Monsters that are also listed as Dark Tuner Monsters, similar to Monsters that are Toon, Union or other secondary "Arch-Types". There are a few Dark Synchro Dark Tuner Monsters, and they are rare. But they can be used for the Dark Synchro Summon of a Decel Dark Synchro Monster. Otherwise, these are still simply both Dark Synchro Monsters and Dark Tuner Monsters with all the rules and conditions that normally apply to both respective types of Monsters.