I think iit should instead do this.
"Sacrifice 30 hp, or reduce it to 1; whichever is greater. Drain all non
quanta. Damage and healing is inverted for 2 turns."
This does several things-
Increases the cost of using it
Makes it harder to chain
The reducing to 1 hp was great -In Theory- I just think it made it too easy to chain. Although perhaps it was changed because getting down to 1 hp was too large of a gamble? If so then disregard this. However, if it was just because it would be too easy to chain, then I say this would be a better route due to how powerful it is.