This means I excluded cards with rules specific to certain events, and I tried to prioritize cards that I thought Commander playgroups would approve of during Rule 0 discussions
Ghalta, Stampede Tyrant Ghalta, Stampede Tyrant is essentially the inverse of Ghalta, Primal Hunger
Other ways to play Ur-Dragon that are too different from this deck to be mentioned: Spell-Slinger A true spell slinger deck is going to require large changes to the deck, and you may wish to use another commander in leu of Ur-Dragon, as it gives little benefit at all to instant and sorceries
5 Mox Jet Currently, the highest-selling card of the Mox Gems, this one depicting a jet-black gem is the epitome of subtle, yet mighty, elegance
Once you cast one half, the card will then move to the graveyard like any other instant or sorcery, and it will only count as a single spell when in the graveyard