I was fun of 3 shapeshifters + 4 wilds till platinum when I realized that there are other better comps:
6 brawlers, 6 knights + imperials, 6 nobles, 6 assassins + 4 void, elementalists + glaciars/rangers etc.
Shapeshifters weaknesses:
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Need time to transform, meanwhile kassadin/demons/assassins/CC items can "eats mana"/delete/stun them.
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They have low damage. Full items 3 stars Nida falls late game. Except full items 3 stars Shyvana but she needs luck to not be CC because without RFC she needs to be close to enemy to transform.
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They are not tankers till transforming and the only strong tank is 2 stars Gnar (every player hunt him). You need luck or level 8 to stack him.
IMO the best comp from these types to be able to win against those I mentioned above is:
3 stars Shyvana (full items, first carry), 2 stars Gnar (tank items), 2 stars Aurlion (second carry), 2 stars any sorcerer, 2 stars Poppy/Cho'Gath,
2 stars Ahri (meat), 2 stars Nida (meat), 2 stars Warwick (meat).
To build such comp you need a lot of higher golds units. Is not easy if you don't have a very strong start comp to reach level 8.
After the nerf no wonder why so few players choose Shyvana. i watched so many time how 2 stars full items Shyvana died without being able to do some moves late game.
4 wilds is the most stronger buff but Ahri, Nida and Warwick are just meat late game.
P.S.
It's really necessary to have 2 stars Gnar otherwise he is just a low meat.