Any enters-the-battlefield abilities of the copied artifact will trigger when the token enters the battlefield
For Prey Upon to be good, green needs to have bigger common creatures than every other color (particularly ones available on turns three and four) and for cheap, instant-speed interaction to be scarce
While limited to just finding artifacts and enchantments, Enlightened Tutor gives white decks a way to grab cards like Smothering Tithe or Overwhelming Splendor
The Abzan (White/Black/Green) One of the five Spirit Dragons, each belonging to their own clan, Betor, Kin to All is an absolute powerhouse with a scaling ability that works with the Abzan clan by getting better the higher in toughness your creatures are
Every creature with a mana value of 6 or more triggers Imotis cascade ability, often chaining into smaller creatures with even more cascade triggers
[card]Masked Admirers[/card] Four mana to draw a card and have a 3/2 is not a great deal in Commander