You might be better collecting 44 pounds of dog poop, and trying that as an anvil. Winter in the prairies, anyways...I know nothing about anvils but noticed this tonight on FB: https://www.facebook.com/marketplace/item/191912803717770/
Sorry. (not really) But wrought Iron with a steel face, is worth pursuing. Cast iron, is not. Esp., if it barely outweighs the hammer that will be beating on it!