If Gogo copies a legendary creature, Gogo will also be legendary, but because its name remains Gogo, Mysterious Mime, the "legend rule" won't cause either of them to be put into the graveyard
English cards , with their more variable quality control, can be harder to grade highly
Enchantment Fall of Gil-galad (As this Saga enters and after your draw step, add a lore counter
Virtue of Loyalty Virtue of Loyaltys ability to continue buffing your creatures and giving you a strong defense can have a big impact on your game
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Another reason I think a banning is unlikely is because I have no idea what Wizards would ban, since there isn't really one card or even one deck that is dominating the format