If another permanent becomes a copy of Court of Vantress, it will become a copy of whatever Court of Vantress is currently copying (if anything) that also has Court of Vantress's last ability
No cards have been added to or removed from the Reserved List since 2002
The Grixis color combination isn't great at ramping mana, but vampires tend to be very efficient in their cost and rely on each other for benefit, besides, you are limited to casting one collected card on each player's turn, so it's not broken right
Illustrated by Rob Alexander Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Banned Comp
The same goes for Thing in the Ice, where counter removal flips it into a massive board wipe threat ahead of schedule
This guide covers the key aspects related to the size of MTG cards, including dimensions, weight, sleeve compatibility, and comparison with other trading card games