Every creature and every beast that has been twisted and enhanced by the power of the Mirari is in the set because Legions is 100% creatures
The difference is that for the video games this is an outrageous con, a way to charge you twice for one game, but in the card game it's actually pretty advantageous for the consumer
Play Rule #13 states: Abilities which refer to other cards owned outside the game (Wishes, Spawnsire, Research, Ring of Ma'ruf) do not function in Commander without prior agreement on their scope from the playgroup. Therefore, Spike is twice banned in Commander, and even if Unstable were allowed, Spike wouldnt be able to be played
Tom Jenkot and his team came up with the awesome showcase treatment, with the circular shape expressing what happens inside the Ring, and of course symbolizing the power that the quest for the One Ring can have in the different characters internal struggles
The Amber/Emerald deck is where you'll find most of the Toy Story characters, along with Merida and other glimmers who are archers and explorers