Cuckooo!
In Cuckooo! you recruit owls, sparrows and cuckoos against the magpies. To defeat a magpie and take part in distributing its coins, the sum of your flock must be higher than it (with the magpie value being between 17 and 20), but can't exceed twenty-one. Try to reach 21 as that's always a winner and you'll be rewarded with an extra coin.