Omega [Opus XIV: Crystal Abyss]

At the end of each player's turn, if there is no Weapon Counter placed on Omega, place 1 Weapon Counter on Omega. If 1 or more Weapon Counters are placed on Omega, Omega deals your opponent 1 point of damage and remove all Weapon Counters from Omega instead.
When Omega is chosen by your opponent's Summons or abilities, you may remove 1 Weapon Counter from Omega. If you do so, Omega gains "Omega cannot be broken." until the end of the turn.