Luckily, with the internet and all its glory, you can play multiplayer mode against your friends without having the need to use the link cable that was available back in the day
If something moves the Melded card (to the Graveyard or Exile or whatever), it moves both physical cards
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Sultai Arisen The ability to pull cards from your graveyard is inherently powerful and both commanders, Kotis, Sibsig Champion and Teval, the Balanced Scale let you do that every turn
Black Black is known for being able to do anything for a price (except destroying artifacts)
Knowing Up the Beanstalk exists and is played regularly could have made for difficult choices when designing new cards, so WotC pulled the plug and banned it before it could inadvertently do some damage