Being somewhat limited in scope is fine, if your deck is doing anything with counters this is basically an auto-include
(9/1/2023) If Defense of the Heart leaves the battlefield while its triggered ability is on the stack, the ability will still resolve as normal.
BPhillipYork: Well this is fairly solid protective card to run, a lot of things care about artifacts and this lets you protect your board from a board wipe, so for white weenie this is really nice to have (or any kind of white go-wide)
Overall, Yuriko is an interesting strategy you can build around, customizing your deck with various Ninjutsu cards, Ninjas, high-cost spells, and ways to make your Creatures unblockable
Notably, Sultai Arisen also breaks the trend of Spirit Dragons being awful in the precon, with Teval actually supporting the graveyard strategy (and the main deck Teval is also great in it)
This is the sort of token generation you get from cards like Bitterblossom, but even better when it's online