What counts as identical for grouping: name, power/toughness, counters, abilities, tapped state, damage, and the absence of attachments must all match
Also, as a recently participating Pokemon TCG Player, I have found no good reason to participate in PRs after my initial experiences with PRs from Fusion Strike and Silver Tempest releases
Overlord of the Balemurk Duskmourn MR Overlord Overlord of the Balemurk is great because it mills four cards as early as turn two, which is stellar for graveyard shenanigan decks
Then River Song deals damage to that player equal to its power. Being able to make River Song stronger when players mess with their deck is one thing, but being able to also hurt players for doing so is excellent
The error was caught by management when they checked the proof sheets
Silver ball