Things like "Warrior tokens you control have 'This token can't be sacrificed'" make for great teasers because, in a vacuum, it's not clear why we'd write that on card
Even without the requisite devotion Klothys stacks up a lot of little effects all at once
Similarly, if the target creature or planeswalker is an illegal target by the time the ability tries to resolve, the ability won't resolve and you won't gain 4 life
(It's an artifact with ", , Sacrifice this token: You gain 3 life.") Whenever you create a token, put a +1/+1 counter on target creature you control other than Rosie Cotton
The additional 1 damage is dealt by the original source of damage
1 Urborg, Tomb of Yawgmoth