original yugioh decks Ranking Every Duel Monsters Era Starter Deck In YGO! Experience a unique blend of monsters and captivating stories with TJT SPORTS. Yu-Gi-Oh Structure Deck - Yugi

Anything that refers to you the player means literally just you

Ill let Mark Rosewater explain from a question he answered back in 2003

However, considering that a vast number of decks use +1/+1 counters, the popular planeswalker cards, and the ever-increasing use of counters in general make it very likely that proliferate will appear again in the future

Legality depends on the tournament format -- Skyknight Vanguard can be legal in some formats and banned or restricted in others

Perhaps not competitively, but in terms of the artwork

The fact that he can activate the effect of Atlantean even from GY is one of the cards that creates a somewhat dangerous atmosphere