[dwd]

Reprints have a different set symbol, and in some cases border colour. For example the Arabian Knights cards that came out in Legends.

There are also differences allowing you to pick an Alpha from a Beta from a 1st Ed.

4th edition onwards, the reprints have a white rather than black border.

The Lotus and Moxes were discontinued after 1st Ed for being too powerful due to their zero casting cost. Instead you have cards that will cost you life and at least some mana to cast so it's not game over first turn.

[derefr]

You'd think that if there was widespread agreement that a card was "too powerful", then it could just be decreed as banned in all formats. Or, to put it another way: why would players want to play a match in which a Lotus or Mox could be played against them, if they themselves might not have the opportunity to also have one? By analogy, who would play a fighting game where your opponent can select a highest-tier character but you're unable to?