If its a Saga, put up to three lore counters on it
That being said, I think the reasons for a card being banned can be broken down into two main categories: A card is too powerful on its own and almost every deck has to have it to be good
Synergizing with self-milling effects, Horde of Notions allows you to pay five mana at instant speed to play an Elemental directly from your graveyard without paying its mana cost
The Card Begins to take Shape Portal (1997) just got a functional reprint of Card not found, which, again, seems strange for a beginner set
This is one of those abilities that's as fun as it is powerful
Simply draw a spell on your turn and as long as you can cast it, Ring of Morrigan will deliver the final point of damage to your opponent