Extra turns give you extra activations of your walkers with all the other bells and whistles that come with taking extra turns
This is one card on my list that I feel surprised that I have to talk about, but people dont respect it as much in Cube and I think you should
Idol Of Oblivion Masters Of Evil makes a ton of tokens each turn, so Idol Of Oblivion is almost always active, and drawing cards is always going to be strong so that you never run out of cards in your hand to play
Again, it seems too expensive for a card that has a Commander Legends printing for less than $8 but, hey, it's Cloud Strife
Though for a five-colored Legendary creature, Id still prefer using The Ur-Dragon because he has more utility at the expense of having a higher mana cost
A shared planar deck must contain at least 40 cards, or at least 10x the number of players in the game, whichever number is smaller