It's in Sultai colors, which has the highest selection of mutate cards to choose from
Its time that changed. He called on the company to promote black content creators and players, hire more black people in public-facing positions and talk to players of color to see how the game can be made more appealing to people of diverse backgrounds
their options are just limited to mana abilities and certain special actions
For older sets, you'll know if you recognise the set symbol, if you don't the end date on the copyright range printed on the card tells you the year that set came out, and you can find a list of sets in many places (I have usually looked here, but wikipedia and scryfall also have lists) Finding the year will give you only a handful of symbols to compare
Its the ultimate prize for completionists but what does it take to claim one
Its a 5-drop with some real card advantage potential in the late game, but you can also just use it to cantrip early on, kind of like a cycling card that reserves the creature for later use