Y'shtola Rhul can immediately come into play and blink a creature on the end step, which happens twice thanks to its ability
In corner cases, Kokusho's ability can even be a deterrent against board wipes if a player has 5 or less life
Throne of the High City I like Throne of the High City in 1- or 2-color decks that don't mind having a colorless utility land
You can play the lock combo of Karn, the Great Creator and Mycosynth Lattice for free, drop crazy stax pieces like God-Pharaoh's Statue or Wandering Archaic, or keep it simple by casting free eldrazi like Ulamog, the Ceaseless Hunger and Kozilek, Butcher of Truth
(Artifacts, legendaries, and Sagas are historic.) The second mode of What Must Be Done cares about what the characteristics of the returned permanent will be when it's on the battlefield, taking into account static abilities that would change its types
We haven't talked about the line yet