On top of that, the fact that it exiles and returns your creature when it leaves play makes it ideal for blink shenanigans
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It is also important to note that you dont give back the lands if Gilt-Leaf Archdruid leaves the battlefield, you keep them forever (or at least until the end of the game)
You dont even need it on the battlefield
While The Valeyard doesn't do much on its own, it's a means to an end to leave your opponents weak for the rest of your deck to close out the game with burn and combat damage
The KTK block had a novel twist: the middle set, Fate Reforged , was designed to be drafted both with the first set, Khans of Tarkir , and the third, Dragons of Tarkir (the block's storyline involves Sarkhan going back in time, and the sets represent alternate timelines)