If you don't, it gains haste." If Rhythm of the Wild leaves the battlefield at the same time that a nontoken creature enters (most likely because that creature has a replacement effect that modifies how it enters, such as Rescuer Sphinx from the War of the Spark release), that creature still gets a +1/+1 counter or haste
One your mana was doubled there were any number of ways to start generating massive card advantage and take over the game in short order, with Wrath of God serving as the four-drop to lead into the Wake and Mirari itself, which was usually the way things ended
That time, Goyf didnt move in price at all
Some people see this as a bad fetchland, but I see it as a license to play five-color decks in Modern
It might always be right there behind you (flash), and once it's there, it'll be unrelenting in its strikes (double strike)
Many full art MTG cards have elements that flow over the frame elements, but I think Ikoria did it best, and that tentacle here is just awesome