As such, you can cast one side first, and later unlock the other side (the other door)
Once the turn ends, the vehicle stops being a creature and must be crewed again during your next turn or your opponents turn if you want to block
While 8 mana is certainly a lot, and that does preclude it from being in many Commander decks, basically any Green Commander deck should be playing Ugin, since its so easy to produce the mana in that color
Nantuko Shade, Genesis, even Whipcorder was a decent dork
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Its played in over 50% of eligible EDHREC decks, which shows how popular of a removal spell it is