If using single sleeves, then the box could easily hold 120+ cards
New Keyword Ability: For Mirrodin
It can only be the commander, since your Commander deck has to be exactly 99 cards (100 with the commander), while Yorion requires your deck to have 20 more cards than the minimum to be the companion
This is perhaps an overly optimistic note on the card, but it does take comparatively less effort to transform the card once, and upon doing so Moonrage Brute is both a more formidable threat and more difficult creature to answer
8 Sai, Master Thopterist Oh Look, Another Artifact Foundations Jumpstart has lots of reprints of classic commanders too, like Sai, Master Thopterist
Whenever Threefold Thunderhulk enters the battlefield or attacks, create a number of 1/1 colorless Gnome artifact creature tokens equal to its power