When The Ur-Dragon does eventually hit the board, it turns the rest of your Dragons into powerful draw engines and threatens to put some of Magic: the Gathering's most devastating threats on the table
Can't Stay Away , Unburial Rites , Dread Return , Visions of Dread , Wake to Slaughter , and Sevinne's Reclamation can bring other cards out of your graveyard if they happen to find themselves in it
If you somehow control Phenomenon Investigators and no choice was made for it (perhaps because another permanent on the battlefield became a copy of it, or it was manifested and later turned face up), it has neither of the two triggered abilities, no matter how much you want to believe (or doubt)
Simply put, in the Draft format of Magic: The Gathering, each participating player picks up three Draft Boosters
Beyond that, it has one of the most useful and efficient draw abilities Ive seen in a while