Professor Onyx made me sacrifice two creatures with the -3 ability.
Not sure why this happened and have never seen it happen. The text of Professor Onyx's sacrifice ability says "each opponent sacrifices a creature with greatest power amongst creatures they control. I had both Edgar Charmed groom and Henrika domnahi on the field. My opponent used this ability after I think a meathook massacre(didn't spend and couldn't spend the mana to wipe them alone with this card) and BOTH were sacrificed despite this not being the text of Professor onyx. It does not say SACRIFICE all creatures with greatest power they control, it says sacrifice "A" creature. It simply isn't the text of the card and this is definitely bugged. I wish i recorded it.
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[Deleted User] commented
Edgar provides a stat pump to vampires. If the opponent used the Meathook Massacre, leaving Henrika at 1 toughness, then made you sacrifice Edgar to Onyx, Henrika would also die
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DSM3Masochist#87792 commented
Not sure why this happened and have never seen it happen. The text of Professor Onyx's sacrifice ability says "each opponent sacrifices a creature with greatest power amongst creatures they control. I had both Edgar Charmed groom and Henrika domnahi on the field. My opponent used this ability after I think a meathook massacre and BOTH were sacrificed despite this not being the text of Professor onyx. It does not say SACRIFICE all creatures with greatest power they control, it says sacrifice "A" creature.