How can you summon the summoned skull if its already summoned?
You need the card game equivalent of a law degree to even play this game.
Yugioh was better when you didn't have to summon monsters and when catapulting your monsters into the castle of darkness was a legit strategy, as was using Mammoth Graveyard to somehow kill a Blue Eyes.
>Envoy of the Beginning
>Can be summoned after Envoy of the End
Way back in the day there used to be entire decks dedicated to Vayu + Skill Drain + Royal Oppression.
Basically the idea was to dump Blackwings into your grave quickly and synchro summon from the grave, while you Skill Drain and Oppression on the board.
Skill Drain negates all monster effects on the board, so you can use Vayu with no drawback.
Royal Oppression let any player pay 800 to negate a special summon, if you negate Vayu, Vayu and what you used stay in the grave instead of being banished, courtesy of there being a comma instead of a semicolon in front of the "and Special Summon 1 "Blackwing" Synchro Monster".
Basically this meant that you could shit out 2k+ monsters easily while shutting down any plays that let your opponent make something that can kill them.
I think this is banned in NA now but when I played, there would be plenty of times where you flip this and sac 4000 LP just to negate a summon