Serpent Generator [Legends] Pro Tour Promos Cao Ren was known throughout

Cao Ren was known throughout the three kingdoms as the fiercest of warriors

If Cosmic Horror is destroyed this way

Set: Pro Tour Promos Type: Creature — Avatar Rarity: Rare Cost: {6}{B}{B} If there are ten or more creature cards total in all graveyards

Threshold — {U}

Purphoros isn't a creature

Serpent Generator [Legends] Pro Tour Promos Cao Ren was known throughoutSet: Legends Type: Artifact Rare Cost: {6} {4}, {T}: Create a 1 1 colorless Snake artifact creature token. It has "Whenever this creature deals damage to a player, that player gets a poison counter." (A player with ten or more poison counters loses the game.)