She's one of the big bad monsters of the format, and whenever she hits the battlefield it immediately becomes less a four-way game and more of a three-on-one
Able to swiftly build up a board of beefy creatures, ping opponents with burn damage, or take to the skies and kill with a few good hits with a commander, this deck has all sorts of roads to victory
Your stuff, it too, get a permanent pump of 1 power for each three dorks you control up to a max of +3
When these explicitly say return it means that its moving those cards from zone to zone
Cunningly, Bolas Planeswalkers from all over the Multiverse lures to Ravnica, the perfect place to execute his dark plans
In short, he represents the pinnacle of control and card advantage