The deck has removal effects and other features that let you adapt and change your play style to your opponents deck
The total point cost of cards in your Main Deck, Extra Deck, and Side Deck (combined) cannot exceed the point cap
Even though your mermen monsters are Fish-Type, your mermonsters are Sea Serpent-Type, just like the Atlanteans, so your Atlantean Dragoons can grab Mermail Abyssmegalo (and future mermonsters) right out of your Deck
Discard one Spellcard to special summon one LV 4 or lower monster from your Deck
You can easily see many different opening hands using the shuffle button
Whats more, once Sacred Phoenix is on the field, its not particularly difficult to deal with, and the decks grind game is absolutely abysmal