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.
This is so wild I love it! 1,000 counters?!
If you play this on turn 1 it's actually a pretty decent wincon without much support. At the risk of embarrassing math: just playing 2 lands and this card (and activating it t2 and beyond) would be:
Ways to untap this thing obviously help a ton, but more permanents actually don't seem to decrease the clock at all.
Could be pretty decent in Limited tbh, this set looks slower than WOE so 8 or 9 turns is not that uncommon