Double Tuning

Double Tuning (also known in some circles as Overtuning) is another method of Summoning Synchro Monsters; as the name suggests, two Tuner monsters are used, rather than the usual one. This type of Synchro Summoning was first seen in Episode 113, used by Jack Atlas when he summoned Red Nova Dragon.

Though Red Nova Dragon is the first to specifically say that it needs 2 Tuner monsters, Double Tuning is possible with XX-Saber Gottoms when the EARTH-Attribute monster(s) used is also a Tuner monster; however, Gottoms can be Summoned with any number of Tuner monsters, provided they are EARTH.

So far, the only monsters that require this method of Summoning are: