Theres just so much to love about The Wandering Emperor
Notice how the black of the mana symbol is completely black throughout
Think the infamous Black Lotus
I love how Xenagoss ultimate ability lets you put each land or creature you exile onto the battlefield, getting around your land drop limit with a stompy flourish and a harrumph
Rendmaw, Creaking Nest Rendmaw, Creaking Nest gives opponents goaded crows that are too scared to attack you the Rendmaw owner, and it makes for a game with good momentum that all players appreciate
As for Training Grounds, it's only a one-of because it only works with about half of our levelers, since Student of Warfare, Transcendent Master, and Lighthouse Chronologist already cost one to level up