We ruled you had to have one torn up, but you didnt have to keep tearing up the one in the deck being played
Urza, Lord High Artificer For: Urza is a very powerful commander, practically a Tolarian Academy of sorts in the command zone
Its less ready to rumble, but its cheaper, and the Coven rider doesnt ask too much considering you probably have a 1/1 token and this as a 3/3 to start with
1st edition Pokmon cards will contain all three features that will differentiate them from the base set
When it comes into play, it taps down all legendary creatures, and it keeps legends from 'readying' in the untap phase, potentially locking them down for the rest of the match
If we consider the nature of the cards we are losing, I think it is pretty clear where the format is heading and having these big changes in mind can easily give us an idea of what would be the decks you should consider playing and why