In short, you get to create a 3/3 Dalek artifact creature token during your end step if an opponent has lost three or more life during your turn
Incapsula incident ID: 1848000720966563409-360563101620769321
If you can protect the Enchanter long enough to get at least one attack in, you can do busted things, like assemble the combo of Phyrexian UnlifePhyrexian Unlife and SolemnitySolemnity over three turns (casting Zur and attacking twice): Even without putting together a combo, Zur can fetch up Stax-style enchanties like Mystic RemoraMystic Remora, PropagandaPropaganda, Ghostly PrisonGhostly Prison, Blind ObedienceBlind Obedience, and many more
cards, combine with yellow's durability to make for an exceptionally robust deck
Historically, this has made blue the strongest colour
Quite the opposite, actually