In my RtO match today my opponent embalmed an honored hydra on the third turn before anything had been discarded or destroyed. He continued to embalm one or more creatures every turn even though nothing was going to graveyards. He also eternalized dreamstealers that weren’t in the graveyard. Planewalker was Vraska (If the cards involved didn’t make that clear). I have screenshots of the battle logs if that matters.
//Edited Title -Brigby