For starters, you can see everything thats going on
10.Undercity Reaches The power of this card is when you flip it over, and can hit people who are unprepared for being attacked by your Llanowar Elves and Silver Myr as well as that Silklash Spider or other creatures that you relay on for playing defense or for their abilities
Even in weaker builds of Urza, the deck snowballs very quickly and can cast a ton of spells without ever really trying
Whenever one or more Assassins you control deal combat damage to a player, exile up to one target Assassin card or card with freerunning from your graveyard
Not only that but as time goes on, the value of cards tends to increase
But I do understand that, as they are, theyre difficult to deal with and seem symptomatic of the common complaint of Magics power creep