In decks with lots of other Auras, such as Pioneer Light-Paws, Emperors Voice decks, All That Glitters can provide a significant buff to your Creature
Others mill themselves in order to trigger abilities that rely on cards being in your graveyard
Depressurize is likely to be blacks best common early on and definitely something to look out for in Draft
(Put two +1/+1 counters on it or create a 2/2 white Spirit creature token.) If Anafenza dies at the same time as one or more other nontoken creatures you control, Anafenza's last ability triggers for each of those other nontoken creatures
Say you play Elspeth on turn 4, make some dudes, then use another ability on turn 5
This two-mana aura protects pretty much any creature of your choice, and as its not only a good card, but one of a kind too, its only natural itd see some spikes here and there