First Penguin has added more consistency to WATER decks, as you can discard 1 card to reveal 1 WATER Synchro Monster in your Extra Deck and add a WATER monster from your Deck to your hand with the same Type but 1 Level lower
More importantly, those will be 5/5 elemental creatures when they get back, so for just 7 mana, you get to add 15 power and toughness to the board
What made this deck so dominant during its peak was the fact that just a single Zoodiac monster was all that was needed in order to summon one of the archetypes many Xyz monsters, rather than the typical requirements for two or more monsters of the same level needed for other Xyz monsters
Hydreigon Mega Absol ex Using only Dark energy, evolve Deino into Hydreigon to be your main damage dealer
I wouldnt have played Ancient Box if I didnt bring the top 20 decks in format stored in my couple of Omnihives that I have from Ultimate Guard which you can check out here
With cards like Powerful Energy +20 damage and Aurora Energy counts as any Basic Energy Lugia and Archeops full power is released