It lets you dig five deep and cloak two cards, which should ideally be a morph or disguise-capable creature
The Ur-Dragon also has a game-ending effect once it hits the board, refilling your hand and slamming more dragons into play for free
(10/4/2004) This could be used to make the target of another spell or ability illegal if this wasn't a sorcery (which makes it really hard to do that)
The company also listed the other banned cards include "Cleanse," "Stone-Throwing Devils," "Pradesh Gypsies," "Jihad," "Imprison," and "Crusade." In addition to being banned in sanctioned tournament play, the company said it will remove them from their online database
2018-07-13 Apply power bonuses from counters the creature enters the battlefield with and continuous effects such as that of Valiant Knight before checking to see if Mentor of the Meeks ability will trigger
Finally, another archetype where white gets better and better is the auras/Voltron archetype , which consists of piling auras or equipment on a single creature for the win