This deck has 16 ways to get more cards, all of which sit on the field doing it painfully slowly because that's the burden we've chosen with this primal surge nonsense
While toughness is typically a measure of a creature's defensive ability, the printing of cards like Assault Formation, which allow creatures to assign damage equal to their toughness, has made these creatures sought after for toughness-themed decks
But its real purpose is its other ability: Whenever a creature an opponent controls is dealt excess noncombat damage, amass Orcs X, where X is that excess damage. It can be a great source of Amass Orcs and it is a part of a 2 card combo with Blasphemous Act that results in near-infinite +1/+1 counters on an Army token and near-infinite damage to all creatures
The Ur-Dragon is potentially the most powerful Dragon commander with its 'eminence' ability making the rest of your Dragons one generic mana less to cast, even if The Ur-Dragon isn't on the battlefield
youd be better off casting a creature with 5 power to threaten the board rather than a simple swap of life totals
I firmly believe that given the soapbox that Sheldon and the other members of the Rules Committee have an article extolling the virtues of playing with un-set cards and a sincere personal recommendation to try it would have been enough