Four tries with Winter & Forest....
1) Serpent - Rare
2) Disco - Rare
3) Elder (ugh) - Super Rare
4) Hot Chocolate - Rare
5) Atlantis - Super Rare
So 4 possible commons for Winter & Forest and after 5 tries I have 3 rares and 2 super rares. I know this is way too small a sample....but from other comments I cannot shake the idea that breeding is rigged.