In my cube particularly it is not all that uncommon for this to have no targets and most of the time it will only have a couple
Bennie Bracks, Zoologist : Bennie can provide an additional draw regularly in token decks, which also help play him with his Convoke option
Pillar Analysis: High Power (Dual Land), Scarcity (Beta, Reserved List), Format Essential (Control Decks)
Meanwhile, for UW Flash, you have a bunch of value creatures, and while banning any one of Archangel Avacyn, Spell Queller, Selfless Spirit, or Gideon, Ally of Zendikar would hurt the deck, none of those cards really stick out as being too good in a vacuumthey are just very strong when combined together
Quakebringer Meanwhile, the Giant tribe has a fearsome five-drop of its own
Generally if you are in green and know you are playing against a heavy artifact deck at some point you will throw this in as it will really help out in that match up and be fine the rest of the time