Destroy All Humans is far more than simple fanservice, being a grounded look at human connection through the card game, unlike other Magic: The Gathering manga
The moment spoiler season finishes, printers will fire up and print proxied versions of the spoiled cards, to immediately be drafted and playtested before the product is available to buy
Until next time, get ready to play on with play boosters
Urabrask's second ability isn't a mana ability, even though it causes you to add mana
TL;DR: There are four mechanics: Party, modal double-faced cards, Kicker, and Landfall Pathway dual lands that use the modal double-faced card mechanic
(You may cast cards from your graveyard for their escape cost.) If The Master of Keys is no longer on the battlefield when its second ability resolves, you'll still mill twice X cards