Translation:

“Doomsday Calendar” {1} (Scryfall name)

Legendary Artifact (M)

Whenever one or more permanents become untapped during your untap step, put that many time counters on “Doomsday Calendar”.

{2}, {T}: Double the amount of time counters on “Doomsday Calendar”.

When there are 1,000 or more time counters on “Doomsday Calendar”, sacrifice it and each opponent loses 1,000 life.