Armageddon Clock [Antiquities] SWSH065 The DEF of the selected

The DEF of the selected monster becomes equal to the combined original DEF of all face-up monsters on your side of the field

return it to the battlefield under its owner's control with a -1/-1 counter on it

if this card attacked an opponent's monster: Negate the effects of that monster (including in the Graveyard)

Set: HeartGold & SoulSilver: Base Set Type: Colorless Rarity: Holo Rare Retreat cost: Colorless

Whenever Ma Chao

Armageddon Clock [Antiquities] SWSH065 The DEF of the selectedSet: Antiquities Type: Artifact Rarity: Uncommon Cost: {6} At the beginning of your upkeep, put a doom counter on Armageddon Clock. At the beginning of your draw step, Armageddon Clock deals damage equal to the number of doom counters on it to each player. {4}: Remove a doom counter from Armageddon Clock. Any player may activate this ability but only during any upkeep step.