From the ad on pokemonTCG.com, looks HGSS-on
Almost guaranteed to do some amount of damage and give opponents a Poison counter, its ability to Proliferate upon doing so is what really puts it over the top
You can then return the card from your graveyard to your hand, or craft it to become Wretched Bonemass which is a Soulflayer-like card
Mythical Island SP Emblem Event (ended) In the Mythical Island SP Emblem Event, players need 2 consecutive wins for a Participation Emblem, 3 consecutive wins for a Bronze Emblem, 4 consecutive wins for a Silver Emblem, and 5 consecutive wins for a Gold Emblem
Bound in Gold | Illustration by Victor Adame Minguez A cards value is determined by its rarity and its demand
Cards at 72% all showed minor cupping, with the exception of the arched cards that were not forcibly rehydratedthey were still slightly arched