When Court of Vantress becomes a copy of a permanent, it's neither entering nor leaving the battlefield
The top-decks are extremely well-rounded and powerful, and most brews will lack tools to deal with both the aggressive Obosh decks and ultra-greedy Yorion lists
Japanese Kuromazoku Fukkatsu no Hitsugi Coffin of Black Magic Tribe Renewal Korean : / , 1 1
Color pie breaks are a bit strange by nature, and some keywords and themes are expected from specific creature types (elves having mana abilities, for example)
Probably more so than most sets
It won't copy any counters or stickers on that creature or any effects that have changed its power, toughness, types, color, and so on, and a creature becoming a copy doesn't remove any such counters or effects that are already applying to it