Every 15 minutes the UFO takes a cow, and its owner gets paid. The longer it grazed, the more it pays.
CA
Abduction log
How it works
Put a cow in the field for a little ETH. 80% goes into the pot, 20% buys $MOO and burns it. The next block walks it in, and about 1 in 50 comes out spotted gold.
Every 15 minutes the UFO comes back and beams up a cow at random, sometimes two. You want it to be yours.
The owner gets paid: 2% of the pot plus 0.25% for every hour it grazed, up to 15%. A gold cow pays triple.
Day 3, the mothership: for one hour a cow goes up every minute.
Day 7: the field closes, and the oldest cow still grazing takes everything left.