You can find it on the tokens by set page
And if it's the last chapter, the controller has to sacrifice that saga, just as they normally would
As long as it doesnt die , youre able to avoid the exile effect
When that spell or ability resolves, the uncounterable spell won't be countered, but any additional effects of the countering spell or ability will still happen
It only copies your spells, which is a knock against it, but when you look at spells that are still affordable with a four mana, 1-card kicker attached to them, you can see how brutal this has potential to be
Its a silly array of abilities, and its hard not to love it