Think of it as a fingerprint
At the beginning of your end step, investigate for each opponent who lost life this turn
= Check out the coverage of Pro Tour - Venice at Sideboard.com in March to see if these were played in Onslaught Block Constructed
It has to be a nontoken creature that wasnt cast
Its worth noting that the emblems stack, so you can reasonably reach a point where your opponents lose 3 or 4 life each time you sacrifice a creature
Here are the lists from 2006 that gained notoriety at Worlds: - B.L.S - Eeveelutions - Mewtrick Mist Energy Coming from the Scarlet/Violet: Temporal Forces collection, it became very strong in Standard 2024.1, at its launch, due to its effect of inhibiting any attack effects from the opponent's Pokmon , whether these effects are "bad status" " (the special conditions) as well as moves that cause "instant K.O.", very present in the meta such as Giratina VSTAR LOR 131 and Roaring Moon ex PR-SV 67, in addition to preventing Tools effects such as Technical Machine: Devolution sv4 177