That is highly unusual and, having watched a few box opening videos on Youtube, I didnt recall seeing this (though I wasnt paying much attention to the commons)
Darkness Metal is in the side-deck as I did use him pre-Leg5, it's more of an extender and win-more card but it's a flex to get him out (well, I'd say everyone can agree KOG-ing with RE is a flex, no?)
Well, that and to create the funniest cards possible as well
D-Terminal [edit] D-Gather [edit] D-Scanner 2.0 [edit] Pendulum Progress 2.0 Armageddon Army [edit] Patamon evolves from Cupimon, and can evolve to Angemon, Tailmon, Siesamon, Witchmon, Devimon, or Black Tailmon
until the end of this turn, it gains 1000 ATK/DEF, also it cannot be destroyed by battle or card effects
On turn 3 you draw your card and lo and behold it is x, where x can be any of the following cards and you need a Claydol GE (of which you run 2 and neither is prized) to evolve your Baltoy GE this turn because your hand is dead otherwise: Usually the other 2 cards are used instead of Pok Ball as they do not involve flipping and therefore should be better than Pok Ball