Armageddon Clock [Antiquities] SWSH065 return it to the battlefield

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)

Send 1 monster card from your hand to the Graveyard to destroy all face-up monsters on your opponent's side of the field with an ATK equal to or less than the ATK of the sent monster

you can destroy all cards on the field

Fusion Summon 1 Fusion Monster from your Extra Deck

Armageddon Clock [Antiquities] SWSH065 return it to the battlefieldSet: 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.