Capture the Sheep
The Sheep is a dumb sheep which can be controlled by any nearby unit just like ordinary sheep (they will change color).
Sheep is immortal. (And villagers will not eat them.)
Other player must capture all Sheeps and bring them to their territory.
Sheeps cannot be garrisoned (but you can build a wall around them).
Sheep can be transported by boat. If boat is destroyed, sheep respawns at nearest home territory or CC. Or we can let Sheep swim.
See http://trac.wildfiregames.com/ticket/4075