Final Fantasy has easily been one of the most successful Universes Beyond Magic: The Gathering has ever released
9/9 indestructible is annoying, but it's the toxic 9 that can kill
Now, you dont quite win the game on the spot, but if youre able to navigate a game into a position where you are able to protect your Karn and resolve Mycosynth Lattice, your opponent will be completely stripped of their ability to cast anything else, thanks to the one-two punch of Lattice turning all opposing lands in artifacts that now cannot be activated thanks to Karn
Those decks often rely on creatures in the graveyard as well, so that can be a nice boon here
The name kind of explains the concept: do something that your opponent doesnt expect you to do
If you can grow Esper Sentinel's stats, it makes it even harder to pay for the tax, almost guaranteeing you'll be able to draw the card from its trigger.