So my friend took this deck to a regional that just past recently and he did really well for playing this deck! He was able to 2-0 most of his opponents and went undefeated for a while.
Gren Maju Da Eiza is a crazy otk card that can get up 10k attack via banished cards.
Necroface helps the deck otk faster by having both you and your opponent banish cards from both decks.
Pot of Desires also plays a key role in this deck, because banishing 10 cards is really good for Gren Maju to be able to otk fast. The spicy tech I like in this deck is the trap card
There Can Be Only One, since the deck doesn't play anything but Gren Maju mainly this card will stop your opponents plays while you are able to build up cards and otk fast. Using
Waking The Dragon to summon Ultimate Falcon is also insane and say good luck getting over that big xyz monster. Have fun!