There are a couple of bonuses that we can make use of, but I dont think its enough to make Stuck in Summoner's Sanctum more than just a moderate playable
Partly thats down to the sheer size of these two colossal franchises meeting, but speculation has been whipped up by the printing of one wholly unique card representing The One Ring, which seems likely to become very valuable indeed
Sure, your opponent gets too as well, but if youre dropping a creature with an exceptionally powerful enter the battlefield trigger, like Atraxa, Grand Unifier, a creature that is practically unstoppable like Emrakul, the Aeons Torn, or an enchantment that gives you free rein to do whatever you like Omniscience, you basically guaranteed a win
Earthshape Earthshape is an Instant that can be used to protect yourself from Instants and Sorceries your opponents might cast with hexproof