Im pretty sure that Zephyr Spirit could have cost two mana as a 0/6 with no drawbacks and would have been just fine
Even though some of the rooms or whatever may be a bit boring/bad, most of them are really strong, and as mentioned before, they cover a wide range of desirable effects in the game
That stipulation wont be too much of a problem though, with all the different effects that cost life in Magic, youll sure to be able to trigger it fairly regularly without doing much else
As such, it's important to include ways to gain life if you're opting to have a deck with Nashi as a part of its game plan
With a full party, this means nine +1/+1 counters for every noncreature spell cast
Panglacial Wurm is a fan-favorite for a reason, and combining that idea of library-shuffling value with a cheaper, reusable payoff seems like it gets closer to an actual win condition