On one hand, its impressive to watch
They're not to be confused with the earlier black and white prototype cards, which featured Gameboy sprites, or the beta playtest cards used to try out the rules
If the copied creature is a token, the new token that's created copies the original characteristics of that token as stated by the effect that created that token, with the exceptions noted above
It can protect valuable cards from black discard, and can combine with library shuffling effects to improve your draw (such as Thawing Glaciers, Flooded Strand, or Ramosian Sergeant)
If Legolas Greenleaf enters the battlefield at the same time as another legendary creature you control, Legolas's Greenleaf's third ability will trigger and put a +1/+1 counter on it
Rebacked cards fail 99% of times the weight test