Rattlegore new warrior legendary

I’m really curious to see how buffs after the deathrattle. It obviously can’t do -1 health to the amount of health when the deathrattle was triggered, or it would be at most 0 health in that scenario and be immediately killed by the game. So if it’s not using the stats at the time of its death, will buffs actually carry over, or is it fixed at 9/9->8/8->7/7->6/6->5/5->4/4->3/3->2/2->1/1->no respawn.

If it can be buffed, that will increase the viability of the card. If it can’t, then it seems hard to tempo out without also using a broom or possibly magic carpet. It would still be very good regardless as a randomly generated minion from things like Evolve/Conjures Calling/etc.