Doubling effects are highly dangerous, because now every pump spell does double damage, and there may even be other things that can double the effect again
Abrade trades one kind of option for another
When Cityscape Leveler is cast, not even when it enters the battlefield, you get to destroy any nonland permanent in play
This means that whether you're trying to establish a board state early within a game, or overwhelm your opponents by doubling the number of tokens you control, Rhys is capable of remaining relevant for a game's duration
The best way to jump into the game remains the $16.99 Starter Decks that release with each expansion, and Azurite Sea is adding two more
(2020-08-07) If a creature enters the battlefield under your control and gains haste, but then loses it before attacking, it won't be able to attack that turn