Woolly Sheep

Sacrifice 3 sheep you control: Build. (To build,
add a building token to a construction you control.)
Breeder: {2}{w} (You may tap two creatures with the
same name that have breeder and pay their breeder
cost. If you do, a token that is an exact copy of the creatures enters the battlefield tapped. You may have
twice as many creatures of a given name with breeder
in your deck as the format you are playing would
normally allow you to have.)