While it doesn't say it can be a Commander like Lord Windgrace or Estrid, the Masked, Grist's static ability says it's an Insect creature as long as it's anywhere but the battlefield
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Following this, you must sacrifice Braskas Final Aeon
In a multiverse, anything is possible
BPhillipYork: Weird card, there are weird ways to lock this out and make it a fairly decent asymmetric card where your opponents don't get to cast it (stuff like Grand Abolisher means they don't get to cast it, or other stax pieces.) I don't know if this is intentional but I think they cleverly exempted Enchantments because sagas are history
The upkeep triggers stack on your turn, at the beginning of your turn, and then you move forward