With the right sequence, its completely possible to attach two or even three Energy to Mega Rayquaza during a single turn, allowing you to threaten massive knockouts much earlier than your opponent expects
This combo is one of the most consistent win conditions in the format and fits well into decks like Jeska/Thrasios, Kraum/Tymna, and other fast shells
That is to say *ahem* please let me untap with Prosper
By discarding "Atlantean Heavy Infantry", "Atlantean Marksman" or "Atlantean Dragoons", to activate the "Mermails" effects you can destroy a card on the field ("Heavy Infantry" and "Marksman") or search your Deck for any Sea Serpent monster ("Dragoons"), such as "Abyssmegalo", while also gaining the "Mermail" effects
A: The number of rounds and Top Cut for the Yu-Gi-Oh
There's no one way that all magic cards have been printed, but the general principles have stayed the same (for now)