Threaten effects, or effects that temporarily steal opposing creatures, aren't super popular in Commander, though the equation certainly changes when that threat's attached to a 10/10 and also morphs the 'borrowed' creature into an annihilating monster for the turn
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There are already a lot of mixed reviews on the Magic: The Gathering Commander Bracket system, but at an absolute minimum, this system delivers a coherent watchlist for Commander cards to be moved on and off the banlist, which is a massive victory for Magics biggest format.
Lets say you have some Magic cards with a certain theme or mechanic you like, and you want to get more cards like them
Similar to a reanimation deck, you can use Athreoss ability to ensure an important permanent sticks around and take advantage of ETB effects multiple times
