Planeswalkers often benefit from damage prevention because it stops your opponents from attacking them effectively, buying plenty of time to ultimate them and get a shiny emblem
Want to catch the most casual people to get into the game without going to a store to play, and more likely, having in game purchases and probably will be with less prizes and nothing broken
Killing an opponents creature doesnt matter much if you give them time to draw into a second one, so you need to make use of the advantage while you have it
You become a card until you leave your library or that library is shuffled
Arahbo, Roar of the World is very popular within the Selesnya color identity, currently sitting as the second most popular
I was actually surprised to see a black expansion symbol on some of these cards, as the power level is really quite high